Lindab CVA Perforated Diffuser Installation Guide
Description
Comdif CVA is a rectangular perforated displacement diffuser for installation in walls or similar structures. CVA has a rectangular connection. Behind the perforated front plate, CVA 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 rectangular duct connection, so the diffuser can be connected at the top or bottom. A wall duct with circular connection is supplied as an accessory. The diffuser is suitable for the supply of large volumes
of moderately cooled air.
- The diffuser is suitable for installation in walls.
- The geometry of the near zone can be adjusted using adjustable nozzles.
- A wall duct can be supplied as an accessory
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
Wall duct: CVAZ – 1 – size
Dimension
| Size | A [mm] | B [mm] | D [mm] | H [mm] | Weight [kg] |
| 3005 | 540 | 50 | 75 | 320 | 4.40 |
| 5005 | 540 | 50 | 75 | 450 | 5.80 |
| 6005 | 540 | 50 | 75 | 580 | 8.70 |
| 6008 | 540 | 80 | 105 | 580 | 9.00 |
| 8008 | 540 | 80 | 105 | 840 | 12.0 |
Cutting dimension: A – 30 x H – 30
Accessories
Can be supplied with wall duct.
Materials and finish
Diffuser: Galvanised steel
Nozzles: Black plastic
Front plate: 1.5 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
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 LW [dB] = LWA + Kok
| Size | 63 | 125 | Centre frequency Hz 250 500 1K 2K | 4K | 8K | |||
| 3005 | 7 | -2 | -2 | 1 | -8 | -17 | -27 | -38 |
| 5005 | 7 | -3 | -1 | 1 | -7 | -17 | -29 | -36 |
| 6005 | 11 | -4 | -1 | 1 | -7 | -17 | -29 | -37 |
| 6008 | 12 | -4 | 2 | 1 | -9 | -20 | -31 | -31 |
| 8008 | 10 | -4 | 2 | 1 | -9 | -19 | -30 | -43 |
Sound attenuation
Sound attenuation ΔL [dB] including end reflection.
| Size | 63 | 125 | Centre frequency Hz 250 500 1K 2K | 4K | 8K | |||
| 3005 | 18 | 13 | 9 | 4 | 1 | 1 | 0 | 1 |
| 5005 | 15 | 11 | 8 | 2 | 2 | 1 | 0 | 0 |
| 6005 | 15 | 10 | 4 | 2 | 0 | 0 | 0 | 1 |
| 6008 | 12 | 8 | 3 | 2 | 0 | 0 | 0 | 0 |
| 8008 | 12 | 8 | 3 | 1 | 0 | 0 | 0 | 0 |
Nearzone
Large diffusion Small diffusion
(factory setting)
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 |
Accessories
Wall duct CVAZ-1
| Size | A [mm] | B [mm] | ØD1 [mm] | Weight [kg] |
| 3005 | 502 | 52 | 125 | 6.0 |
| 5005 | 502 | 52 | 160 | 6.0 |
| 6005 | 502 | 52 | 200 | 6.0 |
| 6008 | 502 | 82 | 250 | 6.5 |
| 8008 | 502 | 82 | 315 | 6.5 |
Ordering example
Lindab reserves the right to make changes without prior notice
2021-05-18
