GAS Silenced Air - Silencers
GAS Silenced Air - Silencers - 150x300 is backordered and will ship as soon as it is back in stock.
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Reduce the noise in your duct work by adding a silencer.
They absorb the noise created by fans and from the air hitting the sides of the duct work.
Silencers remove a lot of unwanted noise; two can be used in series where unwanted noise is a particular problem.

