for
Pleasant &
Healthy
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Air-Distribution
ISO 9001:2000
Product Bulletin 132-D
Ceiling Diffusers
Pleasant .. Serene..
YOU & DASCO...
Since 1964
Partners for good health
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INTRODUCTION
where a high standard of comfort indoor air quality and
controlled performance are to be achieved .
DASCO diffusers are specially designed for ceiling – mounting
applications. They are suitable for supply air as well as exhaust air,
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Ceiling diffusers are the excellent choice for your HVAC system
providing a stable pattern of air diffusion flowing through a number
of concentrically arranged sections.
Controlled air distribution, flow equalization, sound
attenuation, architectural appearance and solid construction are all
reasonable and worthwhile reasons to choose
DASCO CEILING DIFFUSERS
1
Introduction
CEILING DIFFUSERS
GENERAL
DASCO ceiling diffusers DD-6 are designed
to handle a wide range of horizontal airflows
that will meet all HVAC requirements, and yet
with a pleasing appearance to suit architectural
requirements to flush outlets and concealed
fixing method.
DESCRIPTION
Ceiling Diffuser
(One Way)
DASCO ceiling diffusers DD-6 is a multi-vane
type with a fully removable core from its
face for easy installation, with square or round
neck and can be supplied in 1,2,3 &4 way airflow
patterns for all air distribution requirements.
Ceiling Diffuser (Three Way)
Ceiling Diffuser (Two Way)
The diffuser can also be supplied with an opposed
blade damper section (for supply diffusers
only) which in turn is fixed to the outer frame
of the diffuser and is lever operated from
the face of the diffuser. Key operated opposed
blade damper can also be supplied upon
request. The damper frame is separated from
its blades by using nylon bushings to eliminate
corrosion and vibration. Ceiling diffuser DD-6
is available in square and rectangular patterns
for supply air as well as for return air and
which in turn is supplied without opposed
blade damper as standard.
Ceiling Diffuser (Four Way)
2
Ceiling Diffusers
DASCO ceiling diffusers DD-6 is available in
surface mounted type as optional. To identify
the surface mounted diffuser, code SM to be
added. Ceiling diffuser DD-6 is available
with an extended frame to suit the size of
ceiling tiles, the code to be added is EF. Ceiling
diffusers with extended panels can also be
supplied upon request, and to identify the
extended panels ceiling diffusers, code EP to
be added.
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SPECIAL MODELS:
Ceiling Diffuser (Corner)
MATERIAL AND FINISH
Ceiling Diffuser
(Special Architectural Shape)
High quality complete extruded aluminium
construction in silver anodized matt finish.
White polyester powder coating finish or any
other RAL standard colour are also available
upon your requirement.
ORDERING CODE
Supply Air Ceiling Diffuser
DD - 6 a
-
b - WxH
1,2,3,or 4 way airflow patterns
S :Square type
L :Rectangular type
C :Corner type
W x H = Neck size, ( inch or mm )
NOTE :
When specifying a return air ceiling diffuser, use the symbol DDR instead of DD.
3
Ceiling Diffusers
DEFINITIONS
Jet Velocity (Vk)
: In FPM for an outlet or inlet is the velocity measured with an approved
calibrated velometer at specified locations relative to the face of the
outlet or inlet.
Terminal Velocity(Vt) : In FPM is the highest sustained velocity in the mixed air stream arbitrary
specified and used to determine throw.
Velocity pressure (Pd) : The forward moving force of an air stream within a duct measured in
mm (inch) W.G. of water.
( Dynamic pressure)
Static pressure (Ps)
: The outward force within a duct measured in mm (inch) W.G. of water.
Total pressure (Pt)
: The sum of the velocity pressure and the static pressure measured in mm
(inch) W.G. of water.
Throw
: Of an outlet in m (feet), is the distance from the center of the outlet to
a point in the mixed air stream where the highest sustained velocity of
the mixed air stream has been reduced to a specified level (100 FPM & 50
FPM terminal velocity).
Area factor ( Ak)
: Of an outlet or inlet which is also a flow factor determined from the
discharge or intake velocity (Vk) and the volume flow rate (Q)
Ak = Q/Vk in m2 or Ft2
Ceiling Diffuser With an Extended Frame
(Woodall Colour)
4
Ceiling Diffusers
•
•
•
The sound caused by an air outlet is directly proportional to the velocity of the air passing
through it (see table 1).
Noise criteria : The sound pressure level of 8 octave bands acceptable to human ears and
is estimated from table 2.
The room effect : Is the difference between the sound power level of a terminal and the
sound pressure level sensed by human ears in the room, and is affected
by room size, sound absorption characteristic of the room surfaces,
ceiling height, space volume, distance of listener to terminal, terminal
location and number of terminals.
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NOISE CRITERIA
Ambient Sounds :
a.
b.
c.
Environmental sound – Existing within the space with air conditioning equipment off.
External sound – Entering a space from outdoors.
Intruding sound – Entering from adjacent spaces.
Prior to selection of NC level from table 2, the three ambient sounds above must be considered.
APPLICATION
Broadcasting studios, sound and
recording studios.
Concert halls, Auditoriums, Library,
Classrooms
Apartments, residences, hotel bedrooms,
theatres, private offices, hospitals,
churches.
Large office, restaurants, hotels, dining
rooms, public buildings.
Corridors, computer – rooms, cafeterias,
department stores.
Average factories, workshops, garages
Warehouses.
Recommended
Delivery Velocities
(m/s)
1.5 - 2.5
2.5 - 3.5
2.5 - 4.5
3.5 - 5.5
4.5 - 6
5 - 10
Table 1 :The recommended delivery velocities for different applications (ASHRAE GUIDE )
5
Noise Criteria
RECOMMENDED NOISE CRITERIA FOR ROOMS
Table 2 :The recommended NC level for different applications (ASHRAE GUIDE)
6
Noise Criteria
ENGINEERING DATA
The following tables could be helpful before starting the selection of ceiling diffusers.
CEILING
HEIGHT (Ft)
MAX TEMP
DIFF.(Fº )
8
22
10
SIZE (Inch)
MAX CFM
PER SIDE
CFM Range
63 - 200
250
9X9
140 - 450
26
500
12
14
28
30
850
1400
12 X 12
15 X 15
250 - 800
390 - 1250
18 X 18
562 - 1800
16
18
30
32
1800
2700
21 X 21
765 - 2480
24 X 24
1000 - 3200
Table No.3: Maximum CFM per side of the diffuser
as a function of the ceiling height.
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6X6
Table 4 : CFM range for square ceiling diffusers
( Minimum value is for 250 FPM neck velocity )
NOMINAL WIDTH (Inch)
9
6x9
12
6x12
15
6x15
18
6x18
21
6x21
24
6x24
6
9x9
9x12
9x15
9x18
9x21
9x24
9
12x12
12x15
15x15
12x18
15x18
12x21
15x21
12x24
15x24
12
15
18x18
18x21
18x24
18
21x21
21x24
24x24
21
24
Table No.5: Listed sizes available for Ceiling Diffusers.
NOMINAL WIDTH (Inch)
9
12
15
18
21
24
0.096
0.144
0.17
0.2
0.24
0.27
0.13
6
0.2
0.26
0.35
0.32
0.43
0.54
0.37
0.5
0.61
0.43
0.57
0.71
0.48
0.64
0.8
9
12
15
0.77
0.86
1.04
0.97
1.13
1.34
18
21
24
Table No. 6: Area Factor AK (Ft2) for ceiling diffusers.
NOMINAL HEIGHT (Inch)
6
NOMINAL HEIGHT (Inch)
6
6x6
7
Engineering Data
SELECTION PROCEDURE
GENERAL
In general the selection of any air distribution equipment starts from a given CFM that is to be
distributed by this equipment. The distance of throw and the sound level are two other important
factors that have to be considered. A selection procedure of the diffuser best suited for your
application is detailed hereunder.
1.
2.
3.
4.
5.
Select the style best suited of your design from air flow patterns showing in chart (1).
Refer to table 3 for fixing the maximum CFM in any direction for the given ceiling height.
Find the maximum allowable total CFM for the diffuser to be selected.
Enter the selection tables with the value of the CFM you have, and select the best suited
throw, CFM delivered in the A&B directions and NC level which meet your application.
The jet velocity can be calculated using Vk (FPM) = CFM/Ak
Ak is given in table 6.
Vk is used for balancing purposes at site.
AVAILABLE AIR FLOW PATTERNS
Select among the available Square / Rectangular core styles with 1,2,3 or 4 way airflow patterns to
suit air distribution requirements .
(Square / Rectangular to round adapters are also available as an option )
Square
DD-64 S
DD-63 S
DD-62 S
DD-61 S
DD-62 C
Chart 1 : Airflow pattern and product code(Square Ceiling Diffusers)
Rectangular
DD-61 W DD-62 W DD-62 L
DD-64 L
DD-63 L
8
Selection Procedure
DD-61 L
DD-62 CL
DD-62 CL
DD-63L
Chart 2 : Airflow pattern and product code.
(Rectangular Ceiling Diffusers)
A library hall 10 ft. high with the dimensions shown on the figure is supplied with 3600 CFM of
air. Select the diffusers that would fit this application .
Divide the space into six equal areas as shown and center one outlet in each area so that
1.
each outlet will handle 600 CFM . Note that since the areas are (approximately) square, a
square diffuser would best suit the application.
2.
CFM in A direction:
25
X600 = 150 CFM
100
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SAMPLE PROBLEM
CFM in B direction:
25
X600 = 150 CFM
100
The CFM per direction when checked in table 3 proves to be within the table recommended value .
Reading under 600 CFM from the selection table a 12”x12” diffuser is a satisfactory selection .
•
•
•
Throw in A direction = Throw in B direction = 16 – 22 Ft.
Supply N.C. is 35
Supply static pressure drop is 0.104” W.G.
1- Way Ceiling Diffuser ( Woodall Colour )
4- Way Ceiling Diffuser ( Woodall Colour )
9
Selection Procedure
BASIC PERFORMANCE DATA (Supply Air Ceiling Diffusers)
SQUARE & RECTANGULAR NECK
B
A
A
NECK
VELOCITY
$P(s)
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
250
300
400
500
600
700
800
0.018
0.026
0.046
0.072
0.104
0.142
0.186
SIZE NECK PATTERN CFM
63
75
S.NC
<18
<18
SCFM
16 16
19 19
31 31
37 37
4 -7
5-9
6 - 11
8 - 12
9 - 13
10 - 14
11-15
SCFM
24 16
28 19
38 25
47 31
52 37
66 44
75 50
SCFM
-32
-38
-50
-63
-75
-88
-100
THROW
8-12
9-13
11-15
12-17
14-19
14-20
15-21
SCFM
- 63
- 75
- 100
- 125
- 150
- 175
- 200
13-17
14-19
15-12
16-22
17-24
18-26
19-28
AREA
DD-64S
6
DD-63S
X
DD-62S
6
DD-61S
SIZE
NECK
PATTERN
AREA
DD-64S
9
X
0.56
DD-63S
DD-62S
9
DD-61S
SIZE
THROW
THROW
100
125
150
175
200
19
23
27
32
36
25
25
44
44
50
50
CFM
140
169
225
281
338
394
450
S.NC
<18
18
22
27
31
37
40
SCFM
35 35
THROW
SCFM
42 42
7-12
8-13
56
70
10-14
70
84
84
12-16
13-17
105 70
127 84
98
98
14-18
15-19
84 56
10-14 7-12
11-15 8-13
13-17 10-14
14-18 12-16
- 70
- 85
- 113
- 141
- 168
- 197
- 225
THROW
12-16
13-17
15-19
16-21
17-24
18-26
19-27
SCFM
- 140
- 169
- 225
- 281
- 338
- 394
- 450
THROW
16-22
17-24
19-27
20-29
22-31
23-32
25-34
SCFM
148
98
15-20 13-17 16-22 14-18
169
17-24 15-19
CFM
250
300
400
500
600
700
800
AREA
S.NC
<18
20
26
31
35
40
44
SCFM
63 63
12
X
12
1.0
DD-63S
DD-62S
DD-61S
THROW
SCFM
THROW
11-15
94 63
13-17 11-15
SCFM
- 125
75
75
100 100
12-16
14 -18
15 - 20
16 - 22
17 - 23
18 - 24
112 75
150 100
188 125
225 150
263 175
300 200
14-19 12-16
16-22 14-18
17-23 15-20 19-25 11-22 20-27 17-23
- 150
- 200
125
-
125
150 150
175
175
X
6
SIZE
9
112
NECK PATTERN
DD-64S
6
112 112
63 42
THROW
53 35
56
SIZE
X
9
SIZE
200 200
21-29 18-24
250
- 300
- 350
- 400
THROW
15-20
16-22
18-24
19-28
21-29
21-31
24-33
SCFM
- 250
- 300
- 400
- 500
- 600
- 700
- 800
THROW
19-28
21-29
24-33
26-36
28-38
29-41
30-44
12
X
12
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
PATTERN : Is flow pattern as detailed previously.
10
Performance Data
P(s)
: Supply pressure drop in inches W.G.
SCFM
: Side CFM.
THROW : IN feet corresponding to 100 & 50
FPM terminal velocity.
: Room NC for supply based on 8 db
SNC
room effect.
BASIC PERFORMANCE DATA (Supply Air Ceiling Diffusers)
SQUARE & RECTANGULAR NECK
A
A
NECK
VELOCITY
SIZE NECK PATTERN
AREA
DD-64S
15
DD-63S
X
DD-62S
15
DD-61S
SIZE NECK PATTERN
DD-64S
18
DD-63S
X
DD-62S
18
DD-61S
SIZE NECK PATTERN
AREA
21
X
21
DD-64S
DD-63S
DD-62S
DD-61S
A
B
A
B
A
B
A
B
A
B
A
B
300
400
500
600
700
800
0.018
0.026
0.046
0.072
0.104
0.142
0.186
CFM
390
469
625
781
938
1095
1250
S.NC
19
22
28
33
37
44
49
117 117
156 156
195 195
234 234
273 273
312 312
16 - 19
18 - 22
19 - 24
20 - 27
21- 28
22 -29
234 156
293 195
352 234
411 273
469 312
- 625
SCFM
THROW
98
98
14 -18
SCFM
146 98
SCFM
- 195
- 235
- 313
- 391
- 469
- 548
THROW
176
117
19 - 24
20 - 27
22 - 29
22 - 31
23 - 33
24 - 35
26 - 39
SCFM
- 390
- 469
- 625
- 781
- 938
- 1095
- 1250
THROW
22-31
23-33
26-39
27-42
29-46
30-48
32-51
562
675
900
1125
1350
1575
1800
CFM
S.NC
AREA
B
250
$P(s)
B
A
SCFM
THROW
SCFM
<18
141
24
141
17 - 22
211 141
168
30
168
225
20 - 23
253
168
225
22 - 27
338
35
40
45
51
281 281
337 337
394 394
450 450
23 - 29
225 422
281
26 - 32
591 394
-675
- 788
28 - 33
675
- 281
- 338
- 450
THROW
23-29
25-31
28-33
28-34
30-36
31-38
32-40
SCFM
- 562
- 675
- 900
- 1125
- 1350
- 1575
- 1800
THROW
28-34
30-36
32-40
33-43
35-47
36-50
38-54
CFM
765
919
1225
1530
1838
2144
2450
S.NC
22
25
30
36
42
48
54
613 613
191 191
THROW
20 - 26
SCFM
287
191
230
230
306
23 - 27
345
230
306
26 - 32
459
306
383
383
-900
460 460
536 536
28 - 34
29 - 37
31 - 38
33 - 40
574 383
690 460
804 536
919 613
SCFM
- 383
- 460
- 613
- 675
- 919
- 1072
- 1225
THROW
28-34
29-37
33-40
34-42
36-45
36-46
38-48
SCFM
- 765
- 919
- 1225
- 1530
- 1838
- 2144
- 2450
34 - 42
36 - 45
38 - 48
39 - 50
41 - 53
42 - 55
44 - 58
THROW
15
X
15
SIZE
18
450
SCFM
SCFM
- 563
25 - 31
506 337
SIZE
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B
X
18
SIZE
21
X
21
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
PATTERN : Is flow pattern as detailed previously.
P(s)
: Supply pressure drop in inches W.G.
SCFM
: Side CFM.
THROW : IN feet corresponding to 100 & 50
FPM terminal velocity.
SNC
: Room NC for supply based on 8 db
room effect.
11
Performance Data
BASIC PERFORMANCE DATA (Supply Air Ceiling Diffusers)
SQUARE & RECTANGULAR NECK
B
A
A
NECK
VELOCITY
$P(s)
B
SIZE NECK PATTERN CFM
DD-64S
DD-63S
X
DD-62S
24
DD-61S
SCFM
B
DD-63L
A
B
A
B
A
B
A
B
600
700
800
0.018
0.026
0.046
0.072
0.104
0.142
0.186
1000
1200
1600
2000
2400
2800
3200
22
26
31
37
43
49
55
800 800
250 250
300 300
400 400
500 500
600 600
700 700
23 - 29
26 - 30
29 - 35
31 - 37
32 - 40
34 - 43
37 - 47
SCFM
375 250
450 300
600 400
750 600
900 600
1050 700
1200 800
SCFM
- 500
- 600
- 800
- 1000
- 1200
- 1400
- 1600
THROW
THROW
30 - 36
34 - 39
37 - 45
38 - 47
41 - 49
44 - 54
46 - 58
SCFM
- 1000
- 1200
- 1600
- 2000
- 2400
- 2800
- 3200
THROW
35- 42
39 - 46
41 - 50
44 - 54
47 - 58
50 -61
52 - 64
150
188
226
262
300
20
24
28
33
37
94
X
B
500
<18
DD-64L
A
400
S.NC
6
B
300
SIZE NECK PATTERN CFM
AREA
A
250
S.NC
AREA
24
A
SCFM
THROW
SCFM
31
6-11
16
39
19
37
5-8 7-12
19
25
50
5-9 9-14
47
25
63
31
63
6-11 10-14
31
79
37
76
7-12 12-16
37
95
44
87
8-13 13-17
44 109
50
50
- 75
- 94
- 113
- 131
- 150
8 - 13
9 - 14
11- 16
13 - 17
14 - 18
15 - 20
16 - 21
- 94
- 113
- 150
- 188
- 226
- 267
- 300
13 - 17
14 - 18
16 - 21
17 - 22
18 - 24
18 - 25
19 - 26
SIZE NECK PATTERN CFM
125
150
200
250
300
350
400
S.NC
<18
19
23
28
32
38
43
DD-61L
AREA
6
X
12
DD-64L
DD-63L
DD-62L
DD-61L
THROW
SCFM
THROW
SCFM
16 47
THROW
4-7 8-13
SCFM
16
SCFM
THROW
SCFM
THROW
55
19
56
5-8 9-14
25
75
31
94
5-9 11-16 6-11 13-17
19 66
25
88
37
113
44
131
X
24
SIZE
6
125
- 56
DD-62L
24
100
9-14 14-18
- 47
9
SCFM
16
4-7
113
<18
SIZE
50
X
9
SIZE
150
7-12 14-18
8-13 15-20
9-14 16-21
31 110
37 132
44 153
50 175
- 63
- 75
- 100
- 125
- 150
- 175
- 200
10 - 14
11 - 16
14 - 18
15 - 20
16 - 21
16 - 22
17 - 23
- 125
- 150
- 200
- 250
- 300
- 350
- 400
15 - 20
16 - 21
17 - 23
18 - 24
19 - 26
20 - 27
20 - 29
6
X
12
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
PATTERN : Is flow pattern as detailed previously.
12
Performance Data
P(s)
: Supply pressure drop in inches W.G.
SCFM
: Side CFM.
THROW : IN feet corresponding to 100 & 50
FPM terminal velocity.
SNC
: Room NC for supply based on 8 db
room effect.
BASIC PERFORMANCE DATA (Supply Air Ceiling Diffusers)
SQUARE & RECTANGULAR NECK
A
A
NECK
VELOCITY
$P(s)
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
250
300
400
500
600
700
800
0.018
0.026
0.046
0.072
0.104
0.142
0.186
SIZE NECK PATTERN CFM
156
188
250
312
376
438
500
S.NC
<18
19
25
30
34
39
44
AREA
DD-64L
6
DD-63L
X
DD-62L
15
DD-61L
SCFM
16
THROW
4-7 10-14
SCFM
SCFM
THROW
SCFM
THROW
62
16
70
19 75
25 100
5-8 11-16
31 125
37
151
5-9 14-18 6-11 15-20 7-12 16-21
19 85
25
113
31
141
37 170
44 175
8-13 16-22
44
197
50 200
9-14 17-23
- 88
- 94
- 125
- 156
- 188
- 219
- 250
12 - 17
13 - 18
15 - 20
16 - 21
17 - 22
18 - 23
18 - 24
- 156
- 188
- 250
- 312
- 376
- 438
- 500
16 - 21
17 -22
18 -24
19 -26
20 -27
21-29
22-31
188
225
300
375
450
526
600
S.NC
<18
20
26
31
35
40
46
DD-64L
6
DD-63L
X
DD-62L
18
DD-61L
SCFM
THROW
SCFM
SCFM
THROW
SCFM
THROW
SIZE NECK PATTERN CFM
S.NC
AREA
6
X
21
DD-64L
DD-63L
DD-62L
DD-61L
SCFM
THROW
16
78
4-7 12-16
16
86
19
94
25 125
5-8 13-17
5-9 15-20
19
25
103
138
31
157
6-11 16-21
31
172
37 188
44 219
7-12 17-22
8-13 18-23
37 207
44 241
50 275
- 113
- 150
- 188
- 225
- 263
- 300
13 - 18
14 - 19
16 - 21
17 - 22
18 - 23
19 - 24
19 - 26
- 188
- 225
- 300
- 375
- 450
- 526
- 600
17 - 22
18 - 23
19 - 26
20 - 27
21 - 29
22 - 31
23 - 33
219
262
350
438
524
612
700
18
22
28
33
37
42
47
16 94
19 112
25 150
31 188
37 225
44 262
4-7 13-18
5-8 14-19
5-9 16-21
6-11 17-22
7-12 18-23
8-13 19-24
9-14 19-26
19
25 163
31 204
37 244
44 284
50 325
16 102
SCFM
- 100
- 131
- 175
- 219
- 262
- 306
- 350
14 - 18
15 - 20
16 - 22
18 - 22
19 - 24
19 - 26
20 - 27
- 219
- 262
- 350
- 438
- 524
- 612
- 700
18 - 23
19 - 24
20 - 27
21 - 29
22 - 31
23 - 33
24 - 35
THROW
THROW
15
SIZE
6
X
18
SIZE
50 300
SCFM
SCFM
X
50 250
9-14 18-24
- 94
122
6
50 225
SIZE NECK PATTERN CFM
AREA
SIZE
www.dasco.com.kw
B
6
X
21
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
PATTERN : Is flow pattern as detailed previously.
P(s)
: Supply pressure drop in inches W.G.
SCFM
: Side CFM.
THROW : IN feet corresponding to 100 & 50
FPM terminal velocity.
SNC
: Room NC for supply based on 8 db
room effect.
13
Performance Data
BASIC PERFORMANCE DATA (Supply Air Ceiling Diffusers)
SQUARE & RECTANGULAR NECK
B
A
A
NECK
VELOCITY
$P(s)
B
SIZE NECK PATTERN CFM
S.NC
AREA
DD-64L
6
DD-63L
X
DD-62L
24
DD-61L
SCFM
A
B
A
B
A
B
A
B
A
B
A
B
A
B
250
300
400
500
600
700
800
0.018
0.026
0.046
0.072
0.104
0.142
0.186
251
300
400
501
600
700
800
18
22
29
35
39
43
48
131
125 175
37 263
44 306
50 350
4-7 14-19
5-8 15-21
5-9 17-23
6-11 19-24
7-12 20-26
8-13 21-27
9-14 22-29
SCFM
16 118
19 141
25 188
31 235
37 282
44 328
50 375
SCFM
- 126
- 150
- 200
- 250
- 300
- 350
- 400
15 - 20
16 - 22
18 - 25
20 -25
22 - 28
22 - 29
24 - 30
- 251
- 300
- 400
- 501
- 600
- 700
- 800
19 - 24
20 - 25
22 - 28
24 - 29
25 - 32
27 - 34
29 - 38
THROW
THROW
SCFM
THROW
16
110
19
31
220
SIZE NECK PATTERN CFM
188
225
300
375
450
526
600
S.NC
<18
19
25
30
34
39
45
SCFM
35 59
42 71
6-12 9-14
7-13 11-16
AREA
DD-64L
9
DD-63L
X
DD-62L
12
DD-61L
THROW
SCFM
SCFM
9
X
15
DD-64L
DD-63L
DD-62L
DD-61L
77
70 118
85 140
98
165
9-14 13-18 11-16 14-19 12-17 15-20 13-18 16-21 14-19 17-22
42 92
56
122
70 153
85 183
98 214
113 244
- 113
- 150
- 188
- 225
- 263
- 300
THROW
13-18
14-19
16-21
17 - 22
18 - 23
19 - 24
19 - 26
SCFM
- 188
- 225
- 300
- 375
- 450
- 526
- 600
17 - 22
18 - 23
19 - 26
20 - 27
21 - 29
22 - 31
23 - 33
234
281
375
468
562
656
756
THROW
S.NC
<18
SCFM
35 82
42 99
THROW
20
25
56 132
31
70
35
164
85 196
39
98
230
24
SIZE
9
X
12
SIZE
43
6-12 12-17
7-13 13-18
35 100
42 120
56 160
70 199
85 239
96 279
113 322
SCFM
- 117
- 141
- 188
- 234
- 281
- 328
- 378
THROW
14- 19
15 - 20
17 - 22
18 - 23
19 - 24
19 - 26
20 - 27
-234
- 281
- 375
- 468
- 562
- 656
- 756
18 - 23
19 - 24
20 -27
21 - 29
22 - 32
23 - 34
24 - 36
THROW
X
113 265
SCFM
SCFM
6
113 187
- 94
SIZE NECK PATTERN CFM
AREA
35
56 94
SIZE
9-14 15-20 11-16 16-21 12-17 17-22 13-18 18-23 14-19 19-24
9
X
15
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
PATTERN : Is flow pattern as detailed previously.
14
Performance Data
P(s)
: Supply pressure drop in inches W.G.
SCFM
: Side CFM.
THROW : IN feet corresponding to 100 & 50
FPM terminal velocity.
SNC
: Room NC for supply based on 8 db
room effect.
BASIC PERFORMANCE DATA (Supply Air Ceiling Diffusers)
SQUARE & RECTANGULAR NECK
A
A
NECK
VELOCITY
$P(s)
B
SIZE NECK PATTERN CFM
S.NC
AREA
DD-64L
9
X
1.125
DD-63L
DD-62L
18
DD-61L
SCFM
THROW
SCFM
THROW
SCFM
THROW
SCFM
THROW
SIZE NECK PATTERN CFM
AREA
DD-64L
9
X
1.31
DD-63L
DD-62L
21
DD-61L
S.NC
SCFM
THROW
SCFM
THROW
SCFM
THROW
SCFM
THROW
SIZE NECK PATTERN CFM
DD-64L
X
24
1.5
DD-63L
DD-62L
DD-61L
SCFM
THROW
SCFM
THROW
SCFM
THROW
SCFM
THROW
B
A
B
A
B
A
B
A
B
A
B
A
B
250
300
400
500
600
700
800
0.018
0.026
0.046
0.072
0.104
0.142
0.186
281
337
450
562
674
788
900
<18
35
22
106
6-12 13-18
35 123
6-12 14-19
42
28
127
7-13 14-19
42
56
169
33
36
42
47
70 211
85 252
98 296
113 337
9-14 16-21 11-16 17-22 12-17 18-23 13-18 19-25 14-19 19-26
148
56 197
7-13 15-20
70 246
85 295
96 345
9-14 17-22 11-16 18-23 12-17 19-25 13-18 19-26 14-19 20-27
- 164
- 225
- 281
- 337
- 394
- 450
15 - 20
16 - 21
17 - 23
19 - 25
19 - 26
20 -27
21 - 29
- 281
- 337
- 450
- 562
- 674
- 788
- 900
19 - 25
19 - 26
21 - 29
22 - 32
23 - 34
24 - 37
25 - 39
328
394
525
656
788
918
1050
28
33
70 258
38
85 309
41
98 361
45
113 412
18
35 129
22
42 155
6-12 14-19
7-13 15-20
35 147
42 176
6-12 15-20
7-13 16-21
- 164
- 197
- 263
- 328
- 394
- 459
16 - 21
17 - 22
18 - 24
19 -26
20 - 27
21 - 29
21 - 30
- 328
- 394
- 525
- 656
- 788
- 918
- 1050
19 - 26
20 -27
21 - 30
22 - 33
24 - 37
25 - 39
25 - 40
375
450
600
750
900
1050
1200
18
23
30
35
41
45
50
35
153
6-12 15-20
35
170
42
56
9-14 17-22 11-16 18-23 12- 17 19-25 13-18 20-26 14-19 20-27
56 235
70 293
85 352
98 410
56
244
70
305
85 365
98
427
- 525
56 272
70 340
85 408
98
476
18
SIZE
9
X
21
SIZE
9
113 544
6-12 16-21
7-13 17-22
- 188
- 225
9-14 19-24 11-16 20-25 12-17 21-27 13-18 22-28 15-20 22-29
- 300
- 375
- 450
17 - 22
18 - 23
20 - 25
21 - 26
22 - 28
23 - 29
24 - 30
- 375
- 450
- 600
- 750
- 900
- 1050
- 1200
20 - 27
22 - 28
24 - 31
25 - 33
27 - 36
28 - 38
30 - 40
- 525
X
113 487
9-14 18-23 11-16 19-24 12-17 20-26 13-18 21-27 15-20 21-28
42 204
9
113 469
9-14 18-23 11-16 19-25 12-17 19-26 13-18 20-27 14-19 21-29
183
7-13 16-21
207
SIZE
113 384
- 141
S.NC
AREA
9
A
www.dasco.com.kw
B
- 600
X
24
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
PATTERN : Is flow pattern as detailed previously.
P(s)
: Supply pressure drop in inches W.G.
SCFM
: Side CFM.
THROW : IN feet corresponding to 100 & 50
FPM terminal velocity.
SNC
: Room NC for supply based on 8 db
room effect.
15
Performance Data
BASIC PERFORMANCE DATA (Supply Air Ceiling Diffusers)
SQUARE & RECTANGULAR NECK
B
A
A
NECK
VELOCITY
$P(s)
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
250
300
400
500
600
700
800
0.018
0.026
0.046
0.072
0.104
0.142
0.186
SIZE NECK PATTERN CFM
312
375
500
624
750
876
1000
S.NC
<18
21
28
33
36
40
45
56 194
70 242
85 290
98 340
AREA
DD-64L
12
X
1.25
DD-63L
DD-62L
15
DD-61L
SCFM
THROW
SCFM
THROW
SCFM
THROW
SCFM
THROW
35 121
42 146
6-12 14-19
7-13 15-20
35 139
42 167
113 387
6-12 15-20
7-13 16-21
- 156
- 188
- 250
- 312
- 375
- 438
16 - 21
17 - 22
18 - 13
19 - 24
20 - 26
21- 28
21- 30
- 312
- 375
- 500
- 624
- 750
- 876
- 1000
19 - 24
20 - 26
21 - 30
22 - 32
23 - 35
25 - 38
25 - 40
9-14 17-22 11-16 18-23 12-17 19-24 13-18 19-26 14-19 20-27
56 222
70 277
85 333
96 396
9-14 17-23 11-16 18-25 12-17 19-26 13-18 20-27 14-19 21-29
- 500
375
450
600
750
900
1050
1200
S.NC
<18
23
29
33
38
43
48
56 244
70 305
85 365
DD-64L
12
1.5
X
DD-63L
DD-62L
18
DD-61L
SCFM
THROW
SCFM
THROW
SCFM
THROW
SCFM
THROW
SIZE NECK PATTERN CFM
S.NC
AREA
DD-64L
12
X
1.75
21
DD-63L
DD-62L
DD-61L
SCFM
THROW
SCFM
THROW
35 153
42 183
6-12 15-20
7-13 17-22
35 170
42 204
6-12 16-21
7-13 17-22
- 188
- 225
- 300
- 375
- 450
- 525
- 600
17 - 22
17 - 23
18 - 24
20 - 26
21 - 29
22- 30
22 - 33
- 375
- 450
- 600
- 750
- 900
- 1050
- 1200
20 - 26
21 - 29
22 - 33
23 - 35
25 - 38
26 - 40
27 - 42
438
525
700
875
1050
1224
1400
20
24
30
34
39
45
49
35 148
42 221
6-12 17-22
7-13 17-23
35 202
42 242
98 427
70 340
85 408
98 476
70 368
85
440
98 514
113
70 403
85 483
98 563
6-12 17-22
7-13 18-23
- 219
- 263
- 350
- 438
THROW
17-23
18-24
19-26
21-28
22-30
22-31
23-33
SCFM
- 438
- 525
- 700
- 875
- 1050
- 1224
- 1400
21 - 28
22 - 30
23 - 33
24 - 36
26 - 40
27 - 42
28 - 44
THROW
9-14 19-24 11-16 20-26 12-17 21-29 13-18 22-31 14-19 23-33
- 612
12
X
18
SIZE
12
113 644
SCFM
- 525
SIZE
587
9-14 18-24 11-16 20-26 12-17 21-29 13-18 22-30 14-19 22-32
56 322
15
113 544
9-14 18-24 11-16 19-26 12-17 20-27 13-18 21-29 14-19 22-31
56 294
X
113 487
9-14 18-23 11-16 19-24 12-17 20-26 13-18 21-29 14-19 21-30
56 272
12
113 444
SIZE NECK PATTERN CFM
AREA
SIZE
- 700
X
21
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
PATTERN : Is flow pattern as detailed previously.
16
Performance Data
P(s)
: Supply pressure drop in inches W.G.
SCFM
: Side CFM.
THROW : IN feet corresponding to 100 & 50
FPM terminal velocity.
: Room NC for supply based on 8 db
SNC
room effect.
BASIC PERFORMANCE DATA (Supply Air Ceiling Diffusers)
SQUARE & RECTANGULAR NECK
A
A
NECK
VELOCITY
$P(s)
B
SIZE NECK PATTERN CFM
S.NC
AREA
DD-64L
12
X
2.0
DD-63L
DD-62L
24
DD-61L
SCFM
THROW
SCFM
THROW
SCFM
THROW
DD-64L
15
X 1.875
DD-63L
DD-62L
18
DD-61L
15
X
2.185
21
DD-63L
DD-62L
DD-61L
B
A
B
A
B
A
B
A
B
A
B
250
300
400
500
600
700
800
0.018
0.026
0.046
0.072
0.104
0.142
0.186
500
600
800
1000
1200
1400
1600
22
26
32
37
40
45
50
100 300
125 375
150 450
175 525
200 600
63 187
75 225
6-12 18-23
7-13 18-24
63 219
75 263
6-12 18-23
7-13 19-24
- 250
- 300
- 400
- 500
- 600
- 700
- 800
9-14 19-25 11-16 20-27 12-17 22-30 13-18 23-31 14-19 24-33
100 350
125 438
150 525
175 613
9-14 20-25 11-16 21-28 12-17 22-30 13-18 24-32 14-19 25-34
19 - 25
20 - 26
22 - 30
23 - 33
25 - 35
26 - 39
- 600
- 800
- 1000
- 1200
- 1400
- 1600
THROW
21 - 31
22 - 33
24 - 34
27 - 39
28 - 42
30 - 44
32 - 47
469
562
750
938
1125
1312
1500
S.NC
18
23
29
34
SCFM
98 137
118 163
156 219
196 273
THROW
SCFM
THROW
SCFM
THROW
SCFM
THROW
SCFM
THROW
39
43
235 328
274 382
118 222
156 297
196 371
235 445
274 519
24
SIZE
15
312 594
- 235
- 281
- 375
- 469
20 - 26
21 - 27
22 - 30
23 - 34
24 - 36
25 - 38
26 - 40
- 469
- 562
- 750
- 938
- 1125
- 1312
- 1500
23 - 34
24 - 36
26 - 40
28 - 44
30 -47
31 - 49
32 - 51
548
655
875
1095
1312
1529
1750
19
23
29
35
40
44
48
118 210
156 282
196 352
235 421
274 491
98 176
- 656
X
47
14-18 19-24 16-19 19-25 18-22 20-27 19-24 22-30 20-26 23-33 21-27 24-35 22-29 25-37
- 563
12
312 438
14-18 17-21 16-19 18-22 18-22 19-25 19-24 21-27 20-26 22-29 21-27 23-31 22-29 24-34
98 186
SIZE
200 700
- 500
S.NC
DD-64L
A
18 - 24
SIZE NECK PATTERN CFM
AREA
B
SCFM
SIZE NECK PATTERN CFM
AREA
A
- 750
X
18
SIZE
312 563
SCFM
14-18 17-22 16-19 18-23 18-22 19-25 19-25 21-28 20-26 23-30 21-27 24-32 22-29 25-35 15
98 225
118 269
156 360
196 450
235 539
274 628
312 719
THROW
14-18 18-23 16-19 19-24 18-22 20-26 19-25 22-29 20-26 24-31 21-27 25-33 22-29 26-37
SCFM
THROW
SCFM
THROW
www.dasco.com.kw
B
- 274
- 328
- 438
- 548
- 656
- 765
- 875
19 - 24
20 - 25
21 - 28
23 - 32
25 - 34
26 - 38
28 - 41
- 548
- 655
- 875
- 1095
- 1312
- 1529
- 1750
23 - 32
25 - 35
27 - 39
30 - 44
33 - 47
35 - 51
37 - 56
X
21
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
PATTERN : Is flow pattern as detailed previously.
P(s)
: Supply pressure drop in inches W.G.
SCFM
: Side CFM.
THROW : IN feet corresponding to 100 & 50
FPM terminal velocity.
SNC
: Room NC for supply based on 8 db
room effect.
17
Performance Data
BASIC PERFORMANCE DATA (Supply Air Ceiling Diffusers)
SQUARE & RECTANGULAR NECK
B
A
A
NECK
AREA
DD-64L
15
X
2.5
DD-63L
DD-62L
24
DD-61L
SIZE NECK PATTERN
AREA
DD-64L
18
X
2.625
DD-63L
DD-62L
21
DD-61L
SIZE NECK PATTERN
AREA
DD-64L
18
X
3.0
24
DD-63L
DD-62L
DD-61L
A
B
A
B
A
B
A
B
A
B
A
B
300
400
500
600
700
800
0.018
0.026
0.046
0.072
0.104
0.142
0.186
CFM
628
748
1000
1252
1499
1746
2000
S.NC
21
24
30
36
41
45
50
118 256
156 344
196 430
235 515
274 599
$P(s)
SIZE NECK PATTERN
B
250
VELOCITY
B
A
SCFM
THROW
SCFM
THROW
SCFM
98 216
312 688
14-18 17-23 16-19 19-24 18-22 20-26 19-25 22-29 20-26 24-32 21-27 25-34 22-29 26-36
98 256
118 315
156 422
196 528
235 632
274 736
- 314
- 374
- 500
- 626
- 750
19 - 25
20 - 26
21 - 28
23 - 33
25 - 35
26 - 37
28 - 41
- 628
- 748
-1000
- 1252
- 1499
- 1746
- 2000
21 - 33
25 - 36
27 - 40
29 - 45
32 - 48
36 - 53
39 - 59
CFM
655
788
1050
1313
1575
1838
2138
S.NC
18
24
30
36
41
45
50
186 226
225 300
281 376
337 451
394 525
450 619
THROW
SCFM
THROW
SCFM
THROW
SCFM
THROW
141 187
8-15 11-18
-1000
9-16 13-20 10-17 15-22 12-18 17-24 14-20-19-27 15-21 21-29 17-23 24-33
141 257
168 310
225 413
281 516
337 619
394 722
8-15 12-19
9-16 14-21
- 328
- 394
THROW
13-20
15-22
17-24
19-28
22-33
24-37
27-40
SCFM
- 655
- 788
- 1050
- 1313
- 1575
- 1838
- 2138
16 - 25
18 - 28
20 - 31
23 - 34
26 - 38
28 - 41
31 - 46
CFM
748
901
1200
1500
1800
2100
2400
S.NC
20
25
31
37
42
46
51
225 375
281 469
337 563
394 656
450 750
THROW
SCFM
10-17 16-23 12-18 18-25 14-20 21-29 15-21 22-30 17-23 25-35
- 657
- 788
- 919
- 1069
141 233
168 283
8-15 11-19
9-16 14-21
141 304
168 367
8-15 11-20
9-16 14-22
SCFM
- 374
- 451
THROW
12-21
15-23
17-25
19-28
22-34
24-37
SCFM
- 748
- 901
- 1200
- 1500
- 1800
- 2100
- 2400
15 - 25
18 - 27
20 - 29
23 - 33
26 - 39
29 - 43
34 - 49
THROW
SCFM
THROW
THROW
10-17 16-23 12-18 18-25 14-20 20-28 16-22 22-30 18-25 26-34
225 488
281 610
337 732
394 853
- 750
- 900
- 1050
24
SIZE
18
X
21
SIZE
18
450 975
10-17 16-24 12-18 18-26 14-20 21-29 16-22 22-31 18-25 27-35
- 600
X
450 844
SCFM
- 525
15
312 844
14-18 18-24 16-19 19-25 18-22 20-27 19-25 22-30 20-26 25-33 21-27 26-35 22-29 27-38
- 873
SIZE
- 1200
29-42
X
24
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
PATTERN : Is flow pattern as detailed previously.
18
Performance Data
P(s)
: Supply pressure drop in inches W.G.
SCFM
: Side CFM.
THROW : IN feet corresponding to 100 & 50
FPM terminal velocity.
: Room NC for supply based on 8 db
SNC
room effect.
BASIC PERFORMANCE DATA (Supply Air Ceiling Diffusers)
SQUARE & RECTANGULAR NECK
A
A
NECK
VELOCITY
$P(s)
B
SIZE NECK PATTERN CFM
S.NC
AREA
DD-64L
21
X
3.5
24
DD-63L
DD-62L
DD-61L
SCFM
THROW
SCFM
THROW
SCFM
THROW
SCFM
THROW
A
B
A
B
A
B
A
B
A
B
A
B
A
B
250
300
400
500
600
700
800
0.018
0.026
0.046
0.072
0.104
0.142
0.186
871
1053
1400
1748
2100
2452
2800
21
25
30
35
40
46
51
230 - 297
306 -394
383 - 491
460 - 590
536 - 690
191 - 245
613 - 787
12-16 17-21 14-17 19-24 15-19 21-25 16-20 24-29 18-22 27-32 19-24 29-35 20-25 31-37
191 340
230 412
306 547
383 683
460 820
536 958
- 1226
21
613 1094
12-16 18-22 14-17 20-25 15-19 22-27 16-20 25-31 18-22 28-33 19-24 30-37 20-25 33-40
- 1050
SIZE
- 436
- 527
- 700
- 874
- 1400
19 - 23
22 - 26
23 - 29
27 - 33
29 - 35
31 - 38
34 - 42
- 871
- 1053
- 1400
- 1748
- 2100
- 2452
- 2800
22 - 26
25 - 30
27 - 34
31 - 38
33 - 42
35 - 45
38 - 51
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B
X
24
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
PATTERN : Is flow pattern as detailed previously.
: Supply pressure drop in inches W.G.
P(s)
: Side CFM.
SCFM
THROW : IN feet corresponding to 100 & 50
FPM terminal velocity.
: Room NC for supply based on 8 db
SNC
room effect.
Ceiling Diffusers (Special Decorative Frame)
19
Performance Data
BASIC PERFORMANCE DATA (Return Air Ceiling Diffusers)
SIZE
NECK
AREA
6X6
0.25
9x9
0.56
12 X 12
1.0
15 X 15
1.56
8 X 18
2.25
21 x 21
3.06
24 X 24
4.0
6x9
0.375
6 x 12
0.5
6 x 15
0.625
6 x 18
0.75
6 x 21
0.875
6 x 24
1.0
9 x 12
0.75
9 x 15
0.938
9 x 18
1.125
NECK VELOCITY
∆P( R )
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
20
Performance Data
250
0.021
63
<18
140
18
250
<18
390
22
562
20
765
26
1000
24
94
<18
125
<18
156
<18
188
<18
219
20
251
20
188
<18
234
<18
281
18
300
0.031
75
18
169
20
300
23
469
25
675
28
919
29
1200
29
113
<18
150
20
188
21
225
22
262
24
300
24
225
21
281
22
337
24
400
0.055
100
20
225
24
400
29
625
31
900
34
1225
34
1600
34
150
21
200
24
250
27
300
28
350
30
400
31
300
27
375
27
450
30
500
0.086
125
24
281
29
500
34
781
36
1125
39
1530
40
2000
41
188
25
250
29
312
32
375
33
438
35
501
37
375
32
468
33
562
35
600
0.125
150
28
338
33
600
38
938
40
1350
44
1838
46
2400
47
226
29
300
33
376
36
450
37
524
39
600
41
450
36
562
37
674
38
700
0.170
175
33
394
39
700
43
1095
47
1575
49
2144
54
2800
54
262
34
350
39
438
41
526
42
612
44
700
45
526
41
656
42
788
44
800
0.220
200
37
450
42
800
47
1250
52
1800
55
2450
60
3200
59
300
38
400
44
500
46
600
48
700
49
800
50
600
47
756
45
900
49
SIZE
NECK
AREA
9 X 21
1.31
9 x 24
1.5
12 x15
1.25
12 x 18
1.5
12 x 21
1.75
12 x 24
2.0
15 x 18
1.875
15 x 21
2.185
15 x 24
2.5
18 x 21
2.625
18 x 24
3.0
21 x 24
3.5
NECK VELOCITY
$P( R )
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
CFM
R.NC
250
0.021
328
21
375
21
312
20
375
22
438
23
500
25
469
21
548
22
628
24
655
21
748
23
871
24
300
0.031
394
25
450
26
375
24
450
26
525
27
600
29
562
26
655
26
748
28
788
27
901
28
1053
28
400
0.055
525
31
600
33
500
31
600
32
700
33
800
35
750
32
875
32
1000
33
1050
33
1200
34
1400
33
500
0.086
656
36
750
38
624
36
750
36
875
36
1000
40
938
37
1095
38
1252
39
1313
39
1500
40
1748
38
600
0.125
788
41
900
44
750
39
900
41
1050
42
1200
43
1125
42
1312
43
1499
44
1575
44
1800
45
2100
43
700
0.170
918
44
1050
48
876
43
1050
46
1224
48
1400
48
1312
46
1529
47
1746
48
1838
48
2100
49
2452
49
800
0.220
1050
48
1200
53
1000
48
1200
51
1400
52
1600
53
1500
50
1750
51
2000
53
2138
54
2400
55
2800
54
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BASIC PERFORMANCE DATA (Return Air Ceiling Diffusers)
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
P(s)
RNC
: Return pressure drop in inches W.G.
: Room NC for return based on 8 db
room effect.
For Square / Rectangular core styles with 1,2,3 or 4way airflow patterns
21
Performance Data
BALANCING PROCEDURE
To determine the CFM, follow up the following procedure:
1.
Use measuring tools for air velocity like
ALNOR 2220-A lip or 2200 probe, or
Anemotherm air meter.
2.
Take number of measuring points (should be
not less than 4) with the probe so located
and adjusted as to measure the maximum air velocity to the
air flow direction on the face of the diffuser as shown.
3.
Calculate the average measure velocity by using :
V ( average ) = ( V1+ V2+. . . . . . + Vk )
k
4.
Determine the area factor Ak from table (6) considering the proper size .
5.
Calculate CFM :
CFM = AkX Vk
DIMENSIONAL DATA
CEILING DIFFUSERS DD-6
*NOTE :
H = 2 7/16”
H=3
13/
16”
(62mm) WITHOUT DAMPER
(97mm) WITH DAMPER
22
Balancing Procedure
PERFORATED CEILING DIFFUSERS
GENERAL
DESCRIPTION
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DASCO perforated ceiling diffusers DDP-6
are designed especially for installation where
a smooth air flow as well as a symmetrical air
diffusion is required to meet with a certain
HVAC application, and yet with a pleasing apppearance to suit architectural requirements to
flush outlets and concealed fixing method.
Perforated Ceiling Diffuser
(DDP - 64S)
DASCO perforated ceiling diffuser DDP- 6 is a multi-vane type with a fully and easily removable
perforated face with 4 mm diameter holes, 6 mm pitches and 40% of its face open, with square or
round neck and can be supplied in 1,2,3&4 way airflow patterns for all air distribution
requirements. The diffuser can also be supplied with an opposed blade damper section ( for
supply diffusers only ) which in turns is fixed to the outer frame of the diffuser and is lever
operated from the face of the diffuser. Key operated opposed blades damper can also be supplied
upon request. The damper frame is separated from its blades by using nylon bushings to eliminate
corrosion and vibration. DDP-6 perforated ceiling diffuser is available in square and rectangular
patterns for supply –air as well as for return-air and which in turn is supplied without opposed
blade damper as standard.
MATERIAL AND FINISH
High quality extruded aluminium in sliver anodized matt finish. Perforated face is of aluminium
sheet 1.5 mm thickness.
White polyester powder coating finish or any other RAL standard colour are also available upon
your requirement
23
Perforated Diffusers
ORDERING CODE
Supply Air Perforated Ceiling Diffuser
DDP - 6 a -
b
- WxH
1,2,3,or 4 way airflow
patterns
S:Square type
L:Rectangular type
C:Corner type
WxH = Neck size, inch (mm)
NOTE :
When specifying a return air diffuser, use the symbol DDPR instead of DDP.
LISTED SIZES AVAILABLE
(24” X 24” perforated face module ).
Table ( 7 ) : Listed sizes available ( W x H )
for Perforated Ceiling Diffusers
Perforated Ceiling Diffuser (DDP - 64S)
24
Perforated Diffusers
BASIC PERFORMANCE DATA
PERFORATED SUPPLY AIR CEILING DIFFUSERS
B
A
NECK
A B
VELOCITY 250
$P(s)
0.015
B
A B
300
0.023
A B
400
0.041
A B
500
0.066
A B
600
0.94
A B
700
0.13
A B
800
0.172
75
100
125
150
175
200
SIZE NECK PATTERN CFM
63
S.NC
< 18
20
22
25
29
34
38
AREA
DDP-64S
THROW
2-4
3-5
4-6
5-7
6-8
7-9
8-10
DDP-63S
THROW
2-4
3-5
4-6
5-7
6-7
6-8
7-9
DDP-62S
THROW
2-3
2-4
3-5
4-6
5-6
5-7
6-8
DDP-61S
THROW
2
2-3
3-4
3-5
4-5
5-6
6-7
SIZE NECK PATTERN CFM
140
169
225
281
338
394
450
S.NC
< 18
20
23
26
31
36
42
6
X
0.25
6
AREA
9
X
0.56
9
DDP-64S
THROW
3-5
5-7
7-9
8-11
10-12
11-14
13-16
DDP-63S
THROW
3-5
4-6
5-8
7-10
9-11
10-12
11-14
DDP-62S
THROW
2-4
4-5
5-7
6-9
8-10
9-11
10-12
DDP-61S
THROW
2-3
3-5
4-6
5-7
7-9
8-10
9-11
250
300
400
500
600
700
800
S.NC
19
22
25
28
34
39
45
DDP-64S
THROW
4-6
6-8
8-11
10-14
12-16
14-19
16-22
DDP-63S
THROW
4-6
5-7
7-10
9-13
11-14
12-17
14-19
DDP-62S
THROW
3-5
4-6
6-8
8-11
10-13
11-15
12-17
DDP-61S
THROW
3-4
4-5
5-7
7-9
8-11
10-14
11-15
SIZE NECK PATTERN CFM
AREA
12
X
12
1.0
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A
SIZE
6
X
6
SIZE
9
X
9
SIZE
12
X
12
25
Performance Data
BASIC PERFORMANCE DATA
PERFORATED SUPPLY AIR CEILING DIFFUSERS
B
A
A
NECK
A B
VELOCITY 250
$P(s)
0.015
A B
300
0.023
A B
400
0.041
A B
500
0.066
A B
600
0.94
390
469
625
781
S.NC
20
23
27
DDP-64S
THROW
5-7
8-10
DDP-63S
THROW
5-6
DDP-62S
THROW
DDP-61S
THROW
B
SIZE NECK PATTERN CFM
AREA
15
X
1.56
15
A
B
700
0.13
A
B
800
0.172
938
1095
1250
32
38
44
50
10-13
12-16
15-20
18-23
20-26
7-9
9-11
11-14
13-18
16-21
18-23
4-5
6-8
8-10
10-12
11-16
14-18
16-20
3-4
5-7
7-9
9-11
10-14
12-16
14-18
SIZE
15
X
15
PERFORATED RETURN AIR CEILING DIFFUSERS
SIZE
6x6
9x9
12 x12
15 x 15
NECK NECK VELOCITY
AREA
$P( R )
CFM
0.25
R.NC
CFM
0.56
R.NC
CFM
1.0
R.NC
CFM
1.56
R.NC
250
0.019
63
<18
140
19
250
20
390
21
300
0.032
75
20
169
21
300
23
469
24
400
0.059
100
23
225
24
400
26
625
29
500
0.091
125
26
281
27
500
30
781
35
600
0.115
150
30
338
32
600
35
938
40
700
0.148
175
36
394
37
700
40
1095
46
800
SIZE
0.198
200
6x6
39
450
9X9
43
800
12 x12
47
1250
15 x 15
52
Note
SIZE
: Is the nominal neck size in inches.
NICK AREA : Is in square feet.
PATTERN : Is flow pattern as detailed previously.
P(s)
: Supply pressure drop in inches W.G.
26
Performance Data
:
P(R)
THROW :
:
SNC
:
RNC
Return pressure drop in inches W.G.
In feet corresponding to 100 & 50 FPM
terminal velocity.
Room NC for supply based on 8 db
room effect.
Room NC for return based on 8 db
room effect.
ACCESSORIES
SQUARE TO ROUND ADAPTER - AD
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Listed Sizes Available
Square to Round Adapter - AD
Table 8. Listed sizes available of
Square to Round Adapters
•
•
•
The AD is designed as transition adapter permitting the attachement of round flexible or rigid
duct to a square neck diffuser.
The AD is recommended as an accessory for the DD-6/DDP-6 series square neck diffuser.
Galvanized steel construction . With polyster powder coating finish as optional.
27
Accessories
EQUALIZING GRID - EG
•
EG is made of extruded aluminium construction.
The blades are fitted in Nylon bushing to
prevent noise.
•
The EG is designed to assure precision control
and distribution of air flow, through stub duct
and into the neck of the diffuser, The EG are
bracket mounted to ducts.
•
The blades are easy adjustable at any desired
degree individually.
Single Element
Equalizing Grid - EG
Multi Elements
Ceiling Diffusers with Round Plastic Cores
28
Accessories
Quantity
Area
Density
Imperial Unit
Metric Unit
Square meter (m2 )
Square foot
2
From Imperial To
From Metric To
Metric Multiply By
Imperial Multiply By
0.0929
10.764
Square inch
Square millimeter (mm )
645.16
0.00155
Pounds per cubic foot
Kilograms per cubic
16.018
0.624
3
meter (kg/m )
Length
Pressure
inch
millimeter (mm)
25.4
0.0394
foot
millimeter (mm)
304 .8
0.00328
foot
meter (m)
0.3048
3.2808
ya rd
meter (m)
0.9144
1.0938
inch of wa ter column
K ilopa sca l (kPa )
0.2486
4.0219
foot of wa ter column
K ilopa sca l (kPa )
2.9837
0.3252
inch of mercury column
K ilopa sca l (kPa )
3.3741
0.2964
ounces per squa re inch
K ilopa sca l (kPa )
0.4309
2.3206
pounds per squa re inch
K ilopa sca l (kPa )
6.8948
0.145
5 / 9 (º F- 3 2 )
(9 / 5 º C ) + 3 2
Temperature fa hrenheit
Velocity
celcius (º C )
feet per second
meters per second (m/s)
0.3048
3.2808
feet per minute ( fpm)
meters per second (m/s)
0.00508
196.85
miles per hour
meters per second (m/s)
0.44704
2.2369
0.4719
2.119
0.0004719
2119.0
Volume Flow Cubic feet per minute (cfm)
Liters per second (L/s)
3
Cubic feet per minute (cfm)
Cubic meters per second (m /s)
Cubic feet per hour ( cfh)
Milliliters per second( ml/s)
7.8658
0.127133
Gallons per minute(U.S.)
Liters per second( L/s)
0.6309
15.850
Gallons per minute(imperial) Liters per second( L/s)
0.7577
13.198
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CONVERSION TABLE
Table 9. Metric guide conversion factors
29
Conversion Table
TESTING AND APPROVAL
Different samples from DASCO air terminal devices (Ceiling Diffusers) were tested
at ITS (Intertek Testing Services) labs in accordance with:
• Air diffusion council test code for Ceiling diffusers No.
• ISO 5219 “Air distribution and air diffusion laboratory aerodynamic testing and
rating of air terminal devices”.
• ANSI/ASHRAE 70-1991, “Method of testing for rating the performance of air
outlets and inlets”.
CEILING DIFFUSERS WERE TESTED FOR
a.
b.
c.
d.
Sound (NC Noise Criteria).
Static pressure in inches W.G.
Throw, feet.
Ak (Area factor).
30
Testing & Approval
NOW YOU CAN ACHIEVE OPTIMAL COATING PERFORMANCE
ON ALL PRODUCTS YOU PAINT!
DASCO offers a first class service by introducing a wide range of perfect polyester
powder coating on all of its aluminium products of air terminal devices.
The best quality of polyester powder Corro-Coat are used in according to the internnational standards (BS,ISO,DIN,ASTM). PE-F architectural grade polyester powders
are used perfectly with pre-treatment, electrostatic spray and curing in accordance
with the above standards recommendations. A complete range of RAL-Standard
colours are always available in addition to a vast range of special compound colours
as per our customers request.
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COATING WITH POWDER
RAL Standard Colour Chart Swatch
31
Now producing relief knots as in natural wood
New Technology Excellence
1.
2.
3.
Resistance to high radiation and extreme climatic conditions.
It can be used in painting elaborate geometrical shapes producing perfect
quality and aesthetic results.
It is the only technology that can replace wood in traditional areas.
New Mahogany - 21
New Mahogany - 22
32
Testing & Approval
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33
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P.O. Box: 6192 Hawalli 32036 Kuwait.
Tel: +965 4839911 Fax: +965 4815498
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Product Bulletin 132-D
Since 1962