We can offer attenuation to all our air handling units and box fans where required. With our acoustic partners we can size and offer attenuation to suit individual requirements with the use of extensive noise modelling software, acoustic test equipment and when required noise impact assessments.
Our attenuators can be either duct mounted or fitted within the air handling unit.
Acoustic louvres are also available, along with vibration control products.
Rectangular:
Available on request
Circular:
| Duct Diameter (mm) |
Length (mm) |
Insertion loss [dB] for centre frequency [Hz]/th> | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 63 | 125 | 250 | 500 | 1k | 2k | 4k | 8k | ||
| 100 | 300 | 1 | 5 | 7 | 15 | 25 | 25 | 21 | 13 |
| 100 | 600 | 1 | 7 | 12 | 25 | 43 | 48 | 35 | 20 |
| 100 | 900 | 2 | 10 | 17 | 34 | 50 | 50 | 49 | 28 |
| 125 | 300 | 0 | 4 | 5 | 13 | 23 | 20 | 16 | 11 |
| 125 | 600 | 1 | 5 | 10 | 22 | 39 | 37 | 26 | 16 |
| 125 | 900 | 1 | 7 | 14 | 30 | 50 | 50 | 37 | 21 |
| 160 | 300 | 0 | 3 | 5 | 11 | 22 | 16 | 11 | 7 |
| 160 | 600 | 1 | 4 | 8 | 19 | 37 | 28 | 17 | 11 |
| 160 | 900 | 1 | 5 | 12 | 27 | 50 | 39 | 24 | 14 |
| 200 | 600 | 1 | 3 | 8 | 15 | 28 | 19 | 12 | 8 |
| 200 | 900 | 2 | 4 | 11 | 21 | 37 | 28 | 16 | 10 |
| 250 | 900 | 1 | 3 | 9 | 19 | 38 | 19 | 11 | 9 |
| 250 | 1200 | 2 | 4 | 11 | 24 | 50 | 24 | 13 | 11 |
| 315 | 900 | 2 | 3 | 7 | 16 | 31 | 13 | 8 | 9 |
| 315 | 1200 | 2 | 3 | 8 | 20 | 39 | 16 | 9 | 10 |
| 400 | 900 | 0 | 2 | 5 | 12 | 16 | 7 | 5 | 6 |
| 400 | 1200 | 0 | 2 | 7 | 16 | 20 | 9 | 6 | 7 |