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Fan Duct Vent noise - muffle material

Grah8m
in Sound Insulation

Featured Replies

What is actual material used for "sound barrier for ventilation ..."  (ref: EAN 4010184083108 ) ?.

Oddly the cost for a very small amount to do a 100mm vent, can be about  £20.

But what is it made of to justify the expense ?. 

That's a variable flow damper made out of foam and costing about a fiver?

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