2/6/EN/5
Swirl diffusers
Type FD
recommended room heights from 2.60 . . . 4.00 m
TROX GmbH
Heinrich-Trox-Platz
D-47504 Neukirchen-Vluyn
Telephone +49 / 28 45 / 2 02-0
Telefax
+49 / 28 45 / 2 02-2 65
e-mail trox@trox.de
www.troxtechnik.com
Contents · Description
Description
Construction · Dimensions
Materials
Installation · Assembly
2
3
4
4
FD-Q Construction
FD-R Construction
The diffuser face of the type FD consists of fixed, radially
arranged air control blades. The supply air design has
specially arranged internal air guidance elements which are
not required on the extract version.
Due to the rotary swirling motion of the air discharge,
induction of room air occurs very quickly, resulting in rapid
decay of supply air velocity and temperature differential. Air
change rates of 30 per hour can be achieved with supply air
temperature differentials of +10K to –10K.
To stabilise horizontal discharge, all sizes must be mounted
flush with a ceiling.
The minimum mounting height between floor and diffuser
face is 2.60 m.
Flow Visualisation
2
Nomenclature
Acoustic Data
Aerodynamic Data
Order Details
5
6
9
13
Construction · Dimensions
If a circular diffuser face is ordered, the plenum box with side
entry spigot has a 35 mm extension piece fitted to the plenum.
Construction
Type FD swirl diffusers are available in 5 sizes.
Depending on the architectural requirements, the face plate
can be circular or square. The fixed air control blades on the
diffuser face are arranged radially.
The diffuser face can be attached or removed via a centre
fix screw into the plenum box. The screw head is covered
with a decorative cap. The plenum box can be supplied with
either top or side entry spigots and on request, with spigot
lip seals and volume control damper.
For simple adjustment of the volume flow, on request the
plenum box can be provided with a test connection for
measurement of a reference pressure and a volume control
damper operated by sheathed cables. The characteristic
curve of pressure reading versus volume flow rate for each
size of plenum box is supplied.
Note: If a larger size side entry plenum is fitted to a diffuser
face, this should be considered in relation to performance
(lower noise levels and pressure drop).
AK code, diffuser face 1)
Square
Circular
Size
B
D
L
Q
R
H2
K
P
300
280
158
250
298
300
250
290
278
AK001
AK013
400
364
198
350
398
400
295
372
362
AK002
AK014
500
462
198
450
498
500
295
476
460
AK003
AK015
600
559
248
538
598
600
345
567
557
AK004
AK016
625
559
248
538
623
623
345
567
557
AK004
AK016
1) Valid only for FD-...-H!
FD-R-...-V
FD-R-...-H
fixing screw
for diffuser face
FD-Q-...-V
FD-Q-...-H
Plenum Boxes
K
8
8
35
H2
D
H2
D
K
P
FD-Q-...-H
FD-R-...-H
FD-...-V
3
Materials · Installation · Assembly
Materials
Assembly
The diffuser face is made of galvanised sheet steel. The
surface is pre-treated and powder coated white (RAL 9010)
The plenum box is suspended by wires or slotted strips
using the drilled holes in the plenum return edge or hanging
brackets, when provided. For the side entry plenum box,
a self adhesive seal, supplied loose, must be fitted by the
client. The diffuser face is fitted to the plenum box by means
of centre fix screw locating in cross channel in the plenum
box.
The plenum boxes are galvanised sheet steel, the lip seal of
rubber.
Installation
All sizes are suitable for flush mounting into a ceiling.
If the diffuser is installed below a closed ceiling (i. e. freely
suspended) a stable discharge can be achieved if a peripheral
collar 50 mm is provided – available on request.
Measurement of Reference Pressures
For simple adjustment of the volume flow, on request the
plenum box can be provided with a test connection for
measurement of a reference pressure and a volume control
damper operated by sheathed cables. The characteristic
curve of pressure reading versus volume flow rate for each
size of plenum box is supplied.
Installation flush to ceiling
Freely suspended
Installation with cut out in ceiling
Installation
using hangers
Surface mounting on ceiling
Hangers by others
Self adhesive seal,
fitted by others
Fixing of diffuser face
using centre screw
4
Test nipple
Inclined manometer
Plastic tube
Code
White sheathed cable damper open
Diffuser face
Green sheathed cable damper closed
Plenum box
Nomenclature
V·
in l/s: Volume flow per diffuser
V·
in m3/h: Volume flow per diffuser
A, B in m: Spacing between two diffusers
X
in m: Distance between diffuser centre and wall
H1
in m: Distance between ceiling and occupied zone
v- H1 in m/s: Time average air velocity between two
diffusers at distance from ceiling H 1
L
in m: (Horizontal + vertical) distance (X + H 1)
discharge to the wall
v- L
in m/s: Time average air velocity at the wall
tZ
in K: Temperature difference between supply air and
room air
tL
in K: Difference between core and room air temperature
at distance L = A/2 + H 1
or L = B/2 + H 1
or L = X + H 1
A eff in m2: Effective outlet area
p t in Pa: Total pressure drop (supply air)
LWA in dB(A): A-weighted sound power level
LWNC
: NC rating of sound power level
LWNR
: LWNR = LWNC + 2
L pA, L pNC : A-weighting and NC rating respectively of room
sound pressure level L pA L WA – 8 dB
L pNC L WNC – 8 dB
in °: Damper angle
Nomenclature
Quick Selection (Supply air)
V·min
V·max
l/s
3
m /h
l/s
m3/h
LWA max
dB(A)
LW NC max
NC
LWA min
dB(A)
LW NC min
NC
Aeff
m2
300
055
200
40
145
40
34
31
25
0.00884
400
110
400
50
180
40
34
25
20
0.0180
500
145
520
60
215
40
34
20
20
0.0251
600
625
165
600
80
290
40
34
20
20
0.0295
Size
Octave band spectrum on request!
5
Acoustic Data FD-...-V
Supply Air
Correction to diagram 1: Volume control damper setting
Damper
angle 0°
45°
90°
Damper
angle ∆p t
x 1.0
x 1.2
x 2.5
L WA
–
–
L WNC
–
–
0°
45°
90°
∆p t
x 1.0
x 1.5
x 4.0
+2
L WA
–
+3
+7
+2
L WNC
–
+3
+7
Correction to diagram 2: Volume control damper setting
Damper
angle Correction to diagram 4: Volume control damper setting
0°
45°
90°
Damper
angle ∆p t
x 1.0
x 1.1
x 2.1
L WA
–
+1
L WNC
–
+1
1
Sound power level and pressure drop
Size 300
2
Sound power level and pressure drop
Size 400
0°
45°
90°
∆p t
x 1.0
x 1.1
x 2.2
+2
L WA
–
+1
+4
+2
L WNC
–
+1
+4
3
Sound power level and pressure drop
Size 500
4
Sound power level and pressure drop
Size 600 and 625
Pressure drop p t in Pa
Pressure drop p t in Pa
Pressure drop p t in Pa
Pressure drop p t in Pa
6
Correction to diagram 3: Volume control damper setting
Acoustic Data FD-...-H
Supply Air
Correction to diagram 5: Volume control damper setting
Damper
angle Correction to diagram 7: Volume control damper setting
0°
45°
90°
Damper
angle ∆p t
x 1.0
x 1.1
x 2.3
L WA
–
+0
L WNC
–
+0
0°
45°
90°
∆p t
x 1.0
x 1.4
x 4.3
+2
L WA
–
+1
+8
+2
L WNC
–
+1
+8
Correction to diagram 6: Volume control damper setting
Damper
angle Correction to diagram 8: Volume control damper setting
0°
45°
90°
Damper
angle ∆p t
x 1.0
x 1.3
x 2.7
L WA
–
+1
L WNC
–
+1
6
Sound power level and pressure drop
Size 400
45°
90°
∆p t
x 1.0
x 1.4
x 3.5
+3
L WA
–
+1
+4
+3
L WNC
–
+1
+4
7
Sound power level and pressure drop
Size 500
8
Sound power level and pressure drop
Size 600 and 625
Pressure drop p t in Pa
Sound power level and pressure drop
Size 300
Pressure drop p t in Pa
5
0°
150
45
100
Pressure drop p t in Pa
50
45
40
35
50
35
in
dB
(A)
20
30
20
WA
25
30
L
30
40
40
15
25
15
WN
C
20
10
L
Pressure drop p t in Pa
70
7
30
40
m 3/h 150
50
200
70
100
300
l/s 150
400
500
300
200
900
7
Acoustic Data
Extract Air
Correction to diagram 9 and 10: Volume control damper setting
Size
300
400
500
600/625
9
Sound power level and pressure drop FD - . . . - V
10
Damper angle
45°
90°
x 1.0
x 1.1
x 2.0
L WA
–
–
+ 3.0
L WNC
pt
–
–
+ 3.0
x 1.0
x 1.0
x 1.9
L WA
–
–
+ 4.0
L WNC
pt
–
–
+ 4.0
x 1.0
x 1.1
x 2.5
L WA
–
–
+ 7.0
L WNC
pt
–
–
+ 7.0
x 1.0
x 1.1
x 2.2
L WA
–
+ 1.0
+ 4.0
L WNC
–
+ 1.0
+ 4.0
Sound power level and pressure drop FD- . . . - H
Size
Pressure drop p t in Pa
Pressure drop p t in Pa
Size
0°
pt
8
Aerodynamic Data FD 300
Correction!
For an installation below the ceiling line, the values
v-H1, v-L and t L / t Z must be multiplied by a factor of 0.71!
Diffuser arrangement: single or more than one row
if B 4.00 m
H 1 = 0,9
1,2
1,6 2 m
A=1
30
0,
25
0,
20
0,04
)
0,03
)
)
80
(1
15
)
45
v- L in m/s
90
(2
0,
)
3 /h
(m 60)
(3
(2
0
(14
0,3
0
0,02
0,
10
5
0,2
0,2
0,8
1
1,5
2
3
4
0
0,1
5 6m
5
0,8
1
1,5
Spacing A
14
1,6 2 m
5 6m
0
0,
5
40
0,
30
0,
0,
15
0,
0,
2
10
0
0,
25
0,
15
v- H1 in m/s
0,
4
)
3 /h
(m 60)
(3
0)
l/s
(29
00
· =1 0
V
8
25
0,01
5 6m
5)
(21
0)
(18 )
5
(14
40
0,
4
1,6 2 m
50
20
1,2
60
V· = l/s (m
3
80
/
(29 h)
70 0)
(25
0)
60
(21
5)
50
(18
0)
40
(14
5)
0,
3
Square Array of Diffusers
H 1 = 0,9
30
1,2
2
Distance L
Diffuser arrangement: more than one row
if B = 3.00 m
H 1 = 0,9
v- H1 in m/s
0,05
l/s 0
10
80
0,4
5)
12
0,08
· =
V
0
0,5
(1
(18
0
60
15
0,10
40
0,
3m
0
0,6
(21
0)
40
2
0,06
0,8
5)
50
1,5
tL
tZ
V· = l/s
10 (m 3
0 ( /h)
36
0)
80
(29
0)
60
Temperature Quotient
50
v- H1 in m/s
13
Temperature quotient t L / t Z
11
0,8
1
1,5
2
Spacing A
3
4
5 6m
0,8
1
1,5
2
3
Spacing A or B
9
Aerodynamic Data FD 400
Example
Data given:
2 off type FD-Q-H-Z/400
Volume flow per diffuser
V· = 70 l/s
Supply air temperature difference
tZ = –8K
Spacing between two diffusers
A = 1.20 m
Distance between diffuser centre and wall
X = 1.50 m
Distance between ceiling and occupied zone
H 1 = 1.20 m
Diagram 17:
L = A/2 + H 1 = 0.6 + 1.20 = 1.80 m
t L / t Z = 0.08
t L = – 8 · 0.08 = – 0.64 K
L = X + H 1 = 1.50 + 1.20 = 2.70 m
t L / t Z = 0.053
t L = – 8 · 0.053 = – 0.4 K
v- L 0.22 m/s
Temperature Quotient
between two diffusers
at the wall
Diagram 6:
Sound power level and pressure drop
L WA = 26 dB(A) (L WNC = 21 NC)
p t = 16 Pa
Diffuser arrangement:
single or more than one row
v- H1 = 0.10 m/s
15
Diffuser arrangement: single or more than one row
if B 4.00 m
H 1 = 0,9
1,2
Correction!
For an installation below the ceiling line, the values
v- H1, v- L and t L / t Z must be multiplied by a factor of 0.71!
17
1,6 2 m
Temperature Quotient
A=1
1,5
2
3m
0,20
tL
tZ
0,
25
0,
20
0,
15
0,
0,
10
v- L in m/s
4
0
0,1
5 6m
5
0,8
1
1,5
18
4
5 6m
0
0,
5
40
0,
0,
15
0,
0,
2
10
0
0,
25
0,
30
v- H1 in m/s
0)
0,
0,
0,
5)
(18
)
3 /h
( m 50)
(4
0)
(36 )
0
(29
0
10
(21
l/s 5
2
30
0,02
5 6m
· =1
V
25
4
1,6 2 m
5)
(21 )
0
(18
50
1,2
80
60
20
3
Square Array of Diffusers
H 1 = 0,9
V· = l/s
12 (m 3
5 ( /h)
45
0)
10
0(
36
0)
80
(29
0)
15
2
Distance L
1,6 2 m
0,
)
)
0,04
60
50
v- H1 in m/s
)
3 /h
(m 50)
(4
90
1,2
(2
0
0,03
Diffuser arrangement: more than one row
if B = 3.00 m
H 1 = 0,9
0,05
5
0,2
Spacing A
16
60
3
(3
2
0
1,5
0,06
)
15 )
80
1
0,08
(1
0,3
(2
0
0,2
0,8
10
0
0,5
0,4
0,10
l/s 5
12
,60
80
0
0
60
50
v- H1 in m/s
0,12
0,8
· =
V
30
V· = l/s
12 (m 3
5 ( /h)
45
0)
10
0(
36
0)
80
(29
70 0)
(25
0)
60
(21
5)
50
(18
0)
0,16
0,8
1
1,5
2
Spacing A
10
3
4
5 6m
0,8
1
1,5
2
Spacing A or B
3
Temperature quotient t L / t Z
Diagram 15:
Aerodynamic Data FD 500
Correction!
For an installation below the ceiling line, the values
v- H1, v- L and t L / t Z must be multiplied by a factor of 0.71!
Diffuser arrangement: single or more than one row
if B 4.00 m
H 1 = 0,9
1,2
1,6 2 m
0
0
0,06
50
(4
)
(3
60
0,05
)
90
(2
0
0,08
(5
0
0,4
5
0
0,5
)
0,
10
5)
)
15
0,3
(21
0
0,04
5
0,2
0,03
0,2
0,8
1
1,5
2
3
4
0
0,1
5 6m
5
0,8
1
1,5
Spacing A
22
1,6 2 m
5 6m
0
0,
0,
15
0,
0,
2
10
0
0,
25
0,
)
40
0,
5
15
30
(2
0,
30
25
4
5)
(21
20
l/s
15 (m 3
0(
54 /h)
0)
12
5
(4
50
)
10
0
(3
60
)
80
(2
90
)
60
15
0,02
5 6m
)
3 /h
(m 40)
(5 0)
l/s
45
(
50
0)
· 1
(36
V = 125
0)
0
(29
10
0,
4
1,6 2 m
60
0,
=
1,2
80
0,
3
Square Array of Diffusers
H 1 = 0,9
V·
v- H1 in m/s
1,2
2
Distance L
Diffuser arrangement: more than one row
if B = 3.00 m
H 1 = 0,9
v- H1 in m/s
0,10
)
3 /h
( m 40)
0,6
v- L in m/s
30
0,
0,12
0,8
(2
60
20
0,16
l/s 0
15
25
0,20
12
0,
3m
· =
V
20
2
80
0,
1,5
10
15
A=1
tL
tZ
V· = l/s
15 (m 3
/
0(
54 h)
0)
12
5(
45
0)
10
0(
36
0)
80
(29
0)
0,
Temperature Quotient
60
v- H1 in m/s
21
Temperature quotient t L / t Z
19
0,8
1
1,5
2
Spacing A
3
4
5 6m
0,8
1
1,5
2
3
Spacing A or B
11
Aerodynamic Data FD 600 and FD 625
Example
Data given:
4 off type FD-Q-Z-H/600
Volume flow per diffuser
Spacing between two diffusers
Distance between ceiling
and occupied zone
V· = 100 l/s
A = B = 2.00 m
H 1 = 1.60 m
Required: air velocity in occupied zone
Diagram 26:
Square array of diffusers
v- H1 = 0.22 m/s
Correction!
For an installation below the ceiling line, the values
v- H1, v- L and t L / t Z must be multiplied by a factor of 0.71!
23
Diffuser arrangement: single or more than one row
if B 4.00 m
H 1 = 0,9
1,2
25
1,6 2 m
Temperature Quotient
A=1
1,5
2
3m
0,20
V· = l/s
20 (m 3/
0(
72 h)
0)
tL
tZ
0,16
30
25
0,
20
0,
0)
0
0,3
0
0,04
0,
10
0,03
0,8
1
1,5
2
3
4
0
0,1
5 6m
5
0,8
1
1,5
Spacing A
26
5 6m
0
40
0,
5
15
0,
15
0,
0,
10
20
0,
25
0,
0,
(2
90
)
30
20
4
1,6 2 m
0,
25
0,
1,2
80
0,
l/s
15 (m 3
0(
54 /h)
0)
12
5
(4
50
)
10
0(
36
0)
80
0,
0,02
5 6m
0
10
30
=
4
)
3 /h
( m 30)
(6 0)
l/s 5
(54 0)
7
· 1 0
(45
V = 15
0)
5
(36 )
12
0
(29
V·
3
Square Array of Diffusers
H 1 = 0,9
1,6 2 m
v- H1 in m/s
1,2
2
Distance L
Diffuser arrangement: more than one row
if B = 3.00 m
H 1 = 0,9
v- H1 in m/s
0,05
5
0,2
0,2
24
0,06
90
(29
0,4
0,08
(2
15
0)
0
36
80
0
0
0,5
80
0(
0,
0,6
0)
0,10
12
45
10
v- L in m/s
0,
0)
5(
)
3 /h
( m 0)
3
(6 0)
4
l/s 5
(5 0)
5
17
(4 0)
0
6
(3
15 5
)
54
12
0
10
v- H1 in m/s
0,8
· =
V
0(
0,8
1
1,5
2
Spacing A
12
3
4
5 6m
0,8
1
1,5
2
Spacing A or B
3
Temperature quotient t L / t Z
0,12
15
Order Details
Order Code
These codes do not need to be completed for standard products
FD - Q - Z - V - M - L
Square
Circular
Q
R
IE
OEP
Supply
Extract
Z
A
IE
OEP
Top entry plenum
Side entry plenum
V
H
IE
OEP
Volume control damper
with single blade
/
400
300
400
500
600
625
Size
/
0
/
0
/
Volume control damper with
MN
cable and measuring nipple
/
RAL 9016
Not used
State colour
L Spigot with lip seal
M
P1
IEE
EEE
EO
EEE
EEE
P
TE
EE
EE
EE
EZE
EE
EE
EE
U
0 Standard finished
powder coated
to RAL 9010 (GE 50 %) 1)
P1 Powder coated
to RAL 9006 (GE 30 %) 1)
other colours
to RAL . . . (GE 70 %) 1)
Specification Text
Fixed swirl diffusers in square and circular construction for
swirling, horizontal air discharge with high induction, for air
change rates up to 30 per hour, comprising the diffuser face
with radially arranged air control blades, top or side entry
spigot, on request with spigot lip seal and/or volume control
damper. On request, to measure the reference pressure, the
spigot is fitted with a cable-adjusted volume control damper
and measuring nipple.
The plenum with circular side entry spigot can be fitted to
various TROX diffusers; however, variation in performance must
be taken into account.
Design changes reserved · All rights reserved © TROX GmbH (8/2008)
1) GE = gloss level
Materials:
Diffuser face is in galvanised sheet steel. The surfaces are
pre-treated and powder coated white (RAL 9010). The plenum
box is also of galvanised sheet steel, the lip seal of black
rubber.
Order Example
Make: TROX
Type: FD - Q - Z - V - M / 400 / P1 / RAL 9016
13