Perforated diffuser – semicircular
CHA
Description
Comdif CHA is a semicircular perforated displacement diffuser for installation against a wall or column. Behind the perforated front plate, CHA 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.
Order code
Order – accessories
| Cover: | CHAZ – 0 – size |
| Plinth: | CHAZ – 2 – size |
| Wall bracket: | CHAZ – 3 – size |
Dimension
| Size | A mm |
ØD mm |
H mm |
Weight kg |
| 1207 | 250 | 125 | 710 | 6,50 |
| 1607 | 300 | 160 | 710 | 7,50 |
| 2010 | 330 | 200 | 970 | 13,0 |
| 2510 | 400 | 250 | 970 | 18,0 |
| 3115 | 520 | 315 | 1490 | 35,0 |
| 4020 | 630 | 400 | 2010 | 58,0 |
| 5020 | 730 | 500 | 2010 | 78,0 |
| 6320 | 830 | 630 | 2010 | 106 |
Accessories
Can be supplied with duct cover, plinth, and bracket for wall mounting.
Materials and finish
| Diffuser: | Galvanised |
| Nozzles: | Black |
| Front plate: | 1 mm galvanized steel |
| Standard finish: | Powder-coated |
| Standard color: | RAL 9003 or RAL 9010 – white, gloss30 |
The diffuser is available in other colors. Please contact Lindab’s sales department for further information.
Technical data
Recommended maximum volume flow.
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 
| Center frequency Hz | ||||||||
| Size | 63 | 125 | 250 | 500 | 1K | 2K | 4K | 8K |
| 1207 | 11 | -4 | 1 | 1 | -9 | -16 | -28 | -34 |
| 1607 | 9 | -2 | 2 | 0 | -8 | -16 | -28 | -34 |
| 2010 | 10 | -2 | 3 | 0 | -7 | -16 | -28 | -39 |
| 2510 | 11 | 0 | 4 | -2 | -7 | -15 | -27 | -37 |
| 3115 | 13 | 1 | 3 | -1 | -7 | -17 | -29 | -42 |
| 4020 | 7 | 3 | 2 | -1 | -5 | -14 | -19 | -14 |
| 5020 | 7 | 3 | 2 | 0 | -6 | -16 | -19 | -17 |
| 6320 | 7 | 3 | 2 | 0 | -6 | -16 | -29 | -17 |
Sound attenuation
Sound attenuation ΔL [dB] including end reflection.
| Centre frequency Hz | ||||||||
| Size | 63 | 125 | 250 | 500 | 1K | 2K | 4K | 8K |
| 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 |
| 6320 | 5 | 3 | 1 | 1 | 0 | 0 | 0 | 0 |
Nearzone
Table 1
Correction of the near zone (a0.2, b0.2)
| Under- temperature Ti-Tr |
Maximum velocity m/s |
Mean velocity m/s |
Correction factor |
| -3K | 0.20 0.25 0.30 0.35 0.40 |
0.10 0.12 0.15 0.17 0.20 |
1.00 0.80 0.70 0.60 0.50 |
| -6K | 0.20 0.25 0.30 0.35 0.40 |
0.10 0.12 0.15 0.17 0.20 |
0.10 0.12 0.15 0.17 0.20 |
Lindab reserves the right to make changes without prior notice
2021-01-05
Documents / Resources
 |
Lindab CHA Semicircular Perforated Diffuser [pdf] User Manual CHA, Semicircular Perforated Diffuser, CHA Semicircular Perforated Diffuser, Perforated Diffuser, Diffuser |
