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Attenuators

Attenuators
Jaime Graymead
5th July 2019

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
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