CEILING
CEILINGDIFFUSERS
DIFFUSERS
DB Directional Ceiling Diffuser
 Description
ASLI DB series is a type of diffuser with multiple square cone diffusers. Each
cone is one piece die-formed construction with seamless surface and no
corner joints. The square cones profile provides excellent 4 way directional
discharge pattern. This consistent air flow pattern produce rapid mixing,
excellent and stable room air distribution. DB is the most popular square
ceiling diffuser and suitable for rapid cooling usage.
 Materials
• DB-A
Frame: 1.0mm aluminum extrusion.
Blade: 1.0mm aluminum.
Support Bar: 1.5mm galvanized steel.
• DB-T
Frame: 0.7mm galvanized steel.
Blade: 0.6mm galvanized steel.
Support Bar: 1.5mm galvanized steel.
 Surface Finish
• DB-T: white powder coated, oven baked as standard.
• DB-A: white powder coat oven baked or natural anodized.
 Features
• Frame for DB is flush.
• The direction of air flow can be 1-way, 2-way, 3-way or 4-way.
 Accessories
• G1 Opposed blade damper.
• C1 Radial fan blade damper.
• C2 Crown damper.
 Standard Sizes unit : mm
• 290x290, 370x370, 450x450, 600x600, 603x603, 595x595
 DB Construction Illustrations
B=Ceiling size
A=Duct size
40
H
D=Face size
 DB Physical Dimension Unit:mm
Model
DB-T
A (Duct size)
150mm
150mm, 200mm
150mm, 200mm, 250mm, 300mm
150mm, 200mm, 250mm
DB-A
300mm, 350mm
B (Ceiling Size)
D-20
D (Face Size)
290x290
370x370
450x450
600x600
H (Height)
45
60
60
603x603
595x595
80
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DBpage
page 11 of
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DA
CEILING DIFFUSERS
DB Directional Ceiling Diffuser
 DB + G1 Opposed Blade Damper (OBD)
• The G1 opposed blade damper is designed for even distribution of air over the
entire face of diffuser. It is gear operated & can be adjusted from below by
means of key or screw driver. The damper can be set at fully open,
half open & fully close.
• G1 damper are constructed of galvanized steel with matt black as standard finish.
• Height for G1-T 50mm.
 DB + C1 Radial Fan Blade Damper
• The C1 radial fan blade damper is a volume control adjustable from below by
means of key or screw driver.
• Mould pressed, 0.6mm thick galvanized steel with matt black as standard finish.
• Height for C1-T 60mm.
 DB + C2 Crown Damper
C2 Crown Damper
• Model DB has a removable core for easy adjustable of OBD volume damper.
• The removable core is hooked to the inner frame a spring-loaded clip.
Neck sizes above 450mm will not have a removable core.
Adapter
• C2 crown damper provides maximum free area and uniform air distribution.
All stated specifications are updated at the printing date and subject to change without notice or obligation. The actual product might differ from pictures shown.
DB page 2 of 4
CEILING DIFFUSERS
DB Directional
Directional Ceiling
DB
CeilingDiffuser
Diffuser
 DB Product Specification Unit:mm
Model Code
DB-T
DB-A
Accessories
Order Key
Standard Sizes
DB - T + C1 - 150 x 150
150 X 150
G1 Opposed
200 X 200
White Powder Coat,
Frame: 0.7mm Galvanized Steel
Blade Damper
250 X 250
Oven Baked
Blade: 0.6mm Galvanized Steel
300 X 300
Support Bar: 1.5mm Galvanized Steel
C1 Radial Fan Blade
W
H
350 X 350
400 X 400
C2 Crown Damper
Accessories
450 X 450
White Powder Coat,
Frame: 1.0mm Aluminum Extrusion
Oven Baked or Natural Anodized 500 X 500
Blade: 1.0mm Aluminum
Materials
550 X 550
Support Bar: 1.5mm Galvanized Steel
Model
600 X 600
Surface Finish
Materials
 DB Performance Data (Square Inlet)
Neck Size (mm)
Neck Area (m2)
150 x 150
(0.023)
200 x 200
(0.04)
250 x 250
(0.0625)
300 x 300
(0.09)
350 x 350
(0.1225)
Neck Vel. (m/s)
1.5
2.0
2.5
3.0
3.5
4.0
CMH
Total Press (mmAq)
Throw (m)
NC
CMH
Total Press (mmAq)
Throw (m)
NC
CMH
Total Press (mmAq)
Throw (m)
NC
CMH
Total Press (mmAq)
Throw (m)
NC
CMH
Total Press (mmAq)
Throw (m)
NC
125
0.85
1.1-1.4
225
1.0
1.3-1.6
342
1.05
1.4-1.9
485
1.1
1.6-2.3
669
1.05
1.9-2.5
-
170
1.0
1.4-2.2
290
1.05
1.8-2.5
456
1.1
2.2-3.5
663
1.5
2.2-3.1
23
880
1.25
2.3-3.4
24
210
1.1
1.6-2.6
22
365
1.15
2.4-3.1
24
565
1.55
2.6-3.9
815
2.45
2.9-3.7
29
1112
2.0
3.5-4.3
29
250
1.45
2.2-3.5
29
439
1.5
2.8-3.7
27
677
2.3
3.2-4.6
27
975
3.4
3.4-4.5
33
1335
2.70
4.0-5.2
35
294
2.2
2.7-4.1
34
505
2.0
3.3-4.5
34
798
3.25
3.4-4.9
31
1135
4.7
4.3-5.6
38
1540
4.0
5.0-6.3
40
325
2.7
3.3-4.6
41
582
2.5
4.3-5.6
41
918
3.95
3.6-5.2
35
1295
5.9
4.6-6.0
43
1768
5.4
5.8-7.3
50
• Throw is based on terminal velocities of 0.5m/s-0.25m/s respectively.
• NC value is based on a room absorption of 10 dB, re 10-12 watts.
• Dash (-) in space indicates NC value less than 20.
• Performance tables are based on steel construction. For performance with aluminium construction, the pressure loss is 1.15P, and add 2 for NC value.
• Thickness of materials other than standard are available upon request.
All stated specifications are updated at the printing date and subject to change without notice or obligation. The actual product might differ from pictures shown.
DB page 3 of 4
CEILING DIFFUSERS
DB Directional Ceiling Diffuser
 DB Performance Data (Round Inlet)
Neck Size (mm)
Neck Area (m2)
200 ø
(0.0324)
250 ø
(0.0507)
300 ø
(0.0731)
350 ø
(0.0979)
Neck Vel. (m/s)
2
2.5
3
3.5
4
4.5
5
CMH
Total Press (mmAq)
Throw (m)
NC
CMH
Total Press (mmAq)
Throw (m)
NC
CMH
Total Press (mmAq)
Throw (m)
NC
CMH
Total Press (mmAq)
Throw (m)
NC
245
1.0
1.7-2.7
365
1.0
2.2-3.7
528
1.7
2.5-4.3
710
1.3
2.8-5.3
-
298
1.1
2.1-3.2
456
1.4
2.4-3.8
670
2.7
3.1-4.9
23
880
2.0
3.5-5.6
21
365
1.6
2.8-3.7
565
2.2
3.2-4.8
23
785
3.3
3.7-5.5
24
1065
2.8
4.2-6.3
24
415
2.2
2.7-4.0
21
650
3.2
3.4-4.9
25
932
4.6
4.5-5.8
29
1253
4.2
4.7-7.0
30
465
2.4
2.8-4.3
23
730
3.9
3.6-5.2
30
1064
6.1
4.5-6.7
33
1451
5.2
5.5-7.5
34
530
3.3
3.1-4.5
27
825
5.3
4.1-5.5
32
1200
7.8
4.7-6.8
37
1608
6.9
5.8-8.0
38
590
4.3
3.2-4.6
31
919
6.7
4.2-5.8
35
1315
8.8
5.2-7.3
39
1765
8.1
5.6-8.5
40
• Throw is based on terminal velocities of 0.5m/s-0.25m/s respectively.
• NC value is based on a room absorption of 10 dB, re 10-12 watts.
• Dash (-) in space indicates NC value less than 20.
All stated specifications are updated at the printing date and subject to change without notice or obligation. The actual product might differ from pictures shown.
DB page 4 of 4