Lindab CBA Perforated Diffuser Instructions

Lindab CBA Perforated Diffuser

Description

Comdif CBA is a semicircular perforated displacement diffuser for installation against/on a wall or column. Behind the perforated front plate, CBA is equipped with individually adjustable nozzles, making it possible to alter the geometry of the near zone. The diffuser can be turned and has a circular duct connection (MF measure), so the diffuser can be connected at the top or bottom. The diffuser is suitable for the supply of large volumes of moderately cooled air.

• The diffuser is suitable for the supply of large volumes of air.
• The geometry of the near zone can be adjusted using adjustable nozzles.
• Duct covers, plinths and wall brackets can be supplied as accessories.

Maintenance

The front plate can be removed from the diffuser, making it possible to clean the nozzles. The visible parts of the diffuser can be wiped with a damp cloth.

Ordering example

Order – accessories

Cover:               CBAZ – 0 – size
Plinth:               CBAZ – 2 – size
Wall bracket:     CBAZ – 3 – size

Dimension

Size

| A
[mm]| ØD
[mm]| H
[mm]|

Weight
[kg]

---|---|---|---|---

1207

| 350| 125| 710| 6.50
1607| 420| 160| 710|

7.50

2010

| 500| 200| 970| 13.0
2510| 600| 250| 970|

18.0

3115

| 730| 315| 1490| 35.0
4020| 900| 400| 2010|

58.0

5020

| 1100| 500| 2010|

78.0

Accessories

Can be supplied with duct cover, plinth and bracket for wall mounting.

Materials and finish

Diffuser:                   Galvanised steel
Nozzles:                    Black plastic
Front plate:               1 mm galvanised steel
Standard finish:         Powder-coated
Standard colour:       RAL 9003 or RAL 9010 – white, gloss 30.

The diffuser is available in other colours. Please contact Lindab’s sales department for further information.

Technical data

The near zone is given at an under-temperature of -3 K to a maximum terminal velocity of 0.20 m/s.
Conversion to other terminal velocities – see table 1, correction of the near zone for -3 K and -6 K respectively

Sound effect level

Sound effect level LW [dB] = LWA + Kok

Size

|

Centre frequency Hz

---|---

63

| 125| 250| 500| 1K| 2K|

4K

| 8K

1207

| 8| -3| 0| 1| -8| -15|

-27

| -38

1607

| 10| -3| 3| 0| -8| -18| -30| -33
2010| 15| -2| 3| 0| -9| -16|

-30

| -37

2510

| 10| -1| 4| -1| -9| -16| -29| -41
3115| 11| 1| 4| -1| -8| -17|

-30

| -42

4020

| 13| 3| 4| -1| -9| -17| -30| -43
5020| 7| 2| 2| 0| -6| -16|

-19

| -17

Sound attenuation

Sound attenuation ΔL [dB] including end reflection.

Size|

Centre frequency Hz

---|---

Size

| 125| 250| 500| 1K| 2K| 4K| 250
1207| 19| 14| 5| 3| 2| 1| 2|

1

1607

| 16| 12| 4| 1| 2| 1| 2| 2
2010| 12| 8| 4| 2| 3| 2| 2|

2

2510

| 12| 8| 5| 2| 1| 1| 1| 1
3115| 11| 8| 3| 2| 1| 1| 2|

2

4020

| 9| 6| 1| 1| 1| 1| 1| 1
5020| 7| 5| 0| 1| 1| 1| 1|

2

Nearzone

Table 1 Correction of the near zone (a 0.2, b 0.2 )

Under- temperature T i – Tr

| Maximum velocity m/s| Mean velocity m/s|

Correction fact or

---|---|---|---
-K3| 0.20| 0.10| 1.00
0.25| 0.12| 0.80
0.30| 0.15| 0.70
0.35| 0.17| 0.60
0.40| 0.20| 0.50
-6K| 0.20| 0.10| 1.20
0.25| 0.12| 1.00
0.30| 0.15| 0.80
0.35| 0.17| 0.70
0.40| 0.20| 0.60

Lindab reserves the right to make changes without prior notice
2020-10-06

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