Lindab CCA Circular Perforated Diffuser
Description
Comdif CCA is a circular perforated displacement diffuser for freestanding installation. Behind the perforated front plate, CCA 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.
- Plinths 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
- Plinth: CCAZ – 2 – size
Dimension
| Size | ØA [mm] | ØD [mm] | H [mm] | Weight [kg] |
| 1207 | 250 | 125 | 710 | 5.00 |
| 1607 | 300 | 160 | 710 | 7.50 |
| 2010 | 360 | 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 |
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
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 | 63 | 125 | Centre frequency Hz 250 500 1K 2K | 4K | 8K | |||
| 1207 | 8 | –1 | 1 | 1 | –9 | –17 | –28 | –40 |
| 1607 | 10 | –1 | 1 | 1 | –8 | –17 | –29 | –33 |
| 2010 | 10 | –1 | 3 | 0 | –9 | –17 | –27 | –40 |
| 2510 | 7 | –1 | 3 | 0 | –7 | –18 | –28 | –41 |
| 3115 | 13 | 2 | 3 | –1 | –8 | –17 | –29 | –27 |
| 4020 | 13 | 2 | 3 | –1 | –7 | –16 | –28 | –43 |
| 5020 | 7 | 3 | 2 | 0 | –6 | –16 | –19 | –17 |
| 6320 | 7 | 3 | 2 | 0 | –8 | –16 | –20 | –17 |
Sound attenuation
Sound attenuation ΔL [dB] including end reflection.
| Size | 63 | 125 | Centre frequency Hz 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 | 6 | 4 | 1 | 1 | 1 | 1 | 1 | 1 |
| 6320 | 5 | 3 | 1 | 1 | 0 | 0 | 0 | 1 |
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 |
| 0.20 | 0.10 | 1.00 | |
| 0.25 | 0.12 | 0.80 | |
| -K3 | 0.30 | 0.15 | 0.70 |
| 0.35 | 0.17 | 0.60 | |
| 0.40 | 0.20 | 0.50 | |
| 0.20 | 0.10 | 1.20 | |
| 0.25 | 0.12 | 1.00 | |
| -6K | 0.30 | 0.15 | 0.80 |
| 0.35 | 0.17 | 0.70 | |
| 0.40 | 0.20 | 0.60 |
