generator hut and reducing noise

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I have seen generator enclosures that have masonry unit walls 6 foot high with steel doors for access, open aired to top. Inside had channel framework that held replaceable sound absorbing insulation board. Exhaust was lengthened to get a deeper tone closer to match engine decibel, muffled by better automotive type. Space around genny unit was about 3 feet for easy maintenence.

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