Grah8m Posted October 29, 2020 Posted October 29, 2020 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 ?.
dpmiller Posted October 29, 2020 Posted October 29, 2020 That's a variable flow damper made out of foam and costing about a fiver?
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