tek intonat®-attenuators

Attenuators for Natural Ventilation Systems.


Our natural ventilation units can include an attenuation section to reduce the ingress of noise from sources such as road, air traffic and pedestrian including noise from playing areas.


Straight through attenuation:

The attenuators would comprise an outer skin of galvanised steel with an internal media consisting of splitters and/or linings constructed from fire retardent acoustic insulation. In some units the insulation would be retained behind perforated or expanded galvanised steel.

The acoustic performance of the attenuators when incorporated into the ventilation units would be:
Width Height Length Free Area Dnew
1100mm 450mm None 50% 17
1100mm 450mm 100mm 50% 22
1100mm 450mm 200mm 50% 25
1100mm 450mm 250mm 50% 27
1100mm 450mm 400mm 50% 29
1100mm 450mm 600mm 50% 34

S-type attenuators

The S-type attenuators would comprise an outer skin of galvanised skin with internal insulation of fire retardent acoustic insulation.

The insulation also has excellent thermal insulation to minimise cold bridging across the unit.

The acoustic performance of the attenuators when incorporated into the ventilation units would be:
Width Height Length Free Area Dnew
1400mm 800mm 80mm 0.095 25
1400mm 800mm 80mm 0.078 27
1400mm 800mm 80mm 0.042 33
1400mm 800mm 160mm 0.207 23
1400mm 800mm 160mm 0.190 25
1400mm 800mm 160mm 0.154 28
1400mm 800mm 240mm 0.319 22
1400mm 800mm 240mm 0.302 24
1400mm 800mm 240mm 0.266 27

Attenuators for Roof Terminals

Attenuators would comprise an outer skin of galvanised sheet with an internal lining of acoustic thermal insulation.

The attenuators may also contain acoustic splitters comprising rockwool acoustic insulation retained behind perforated or explanded galvanised steel.

Passive Unit
Width Height Length Dnew
1000mm 1000mm 1000mm 34
1000mm 750mm 1000mm 21
1000mm 250mm 1000mm 34
1000mm
Lining Only
750mm 1000mm 13
800mm 750mm 800mm 33
800mm
Lining only
750mm 800mm 15
Active Unit
Width Height Length Dnew
1000mm 1000mm 1000mm 39
1000mm 750mm 1000mm 34
1000mm 250mm 1000mm 34
1000mm
Lining Only
750mm 1000mm 16
800mm 750mm 800mm 35
800mm
Lining only
750mm 800mm 19

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