Flex Duct Material for Ventilation System Sound Control
It was recommended to me by a couple of independent sources to include a short run of flex duct between my HRV and the supply and return manifolds, for noise control purposes. The idea is to decouple the unit from the ducting as a means of reducing vibration transmission. I’ve looked at several options:
1. Vinyl dryer duct. Very flimsy, has a pretty nasty smell to it, probably not a good choice from an air quality standpoint.
2. Foil dryer duct. Also very flimsy.
3. Semi-rigid aluminum dryer duct. Seems too rigid to actually achieve the goal of decoupling.
4. Clear PVC hose typically used for dust collection systems. I have this in my wood shop, and it seems fairly inert, but obviously still maybe a concern being PVC. Very durable and smooth walled. http://store.workshopsupply.com/catalogue/blackjack-dust-collection-pvc-hose-10-feet-p-3013.html
5. Polyurethane dust collection hose. Similar to the PVC stuff, but maybe polyurethane is better in terms of potential off gassing? http://store.workshopsupply.com/catalogue/blackjack-dust-collection-pur-hose-10-feet-p-3012.html
Opinions? I’m currently debating between the foil duct and the polyurethane hose.
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