SOUND ATTENUATOR

Attenuators have been tested in accordance with ASTM E477.

Attenuators are constructed in accordance with DW144 H.V.C.A. duct work manual so that it is built to the same standard as the duct work.

Splitters are as a standard in filled with 24 kg/m3 with a woven glass fiber fabric facing and is covered with a galvanized perforated sheet steel. This construction ensures that there is no migration of infill.

Design allows for a maximum velocity of 15m/s and 50 Pa pressure loss in passageways to ensure that no noise regeneration occurs.

Splitter section are fitted with bull-nosed ends i.e. Rounded ends in order to provide a smooth air flow on entry to the attenuator airways thereby reducing turbulence, excess pressure and the possibility of noise regeneration.

The attenuator is constructed entirely of pre-galvanized sheet steel.

All joints are sealed with a weatherproof mastic to ensure an air tight seal and reduce the possibility of air noise.