The product John used is what the marine industry calls acoustic foam. It is an absorber, but has no barrier. The description says 21 sq ft and the total weight 2.2 lbs.
Mass is what stops noise. Imagine having a conversation with someone, and a wall of this foam is installed between you. Now imagine an 8" concrete block wall instead of foam.
Foam absorbs noise, and will reduce noise inside the enclosure by reducing the increase in noise from reverberation against the solid panels of the enclosure. This reduces the noise outside the enclosure.
By incorporating a decoupled mass layer as a noise barrier you increase the performance of the noise reduction by a massive amount.
I will add that most generator manufacturers install acoustic foam in their smaller generators, say 50Kw and down. A vinyl/foam insulation will provide much better performance than the OEP product in most smaller generators.
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Originally Posted by JohnEasley
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