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Originally Posted by Bill Harsey
The box looks like it would work. I've seen gas generators made fairly quiet by just digging a hole in the ground and putting plywood over the top and you already have the vent system figured out.
Your article about "box in box" references lead for sound insulation, we used lead lined heavy foam rubber on our logging yarder (V-12 Cummins Engine) to get the noise down to acceptable OSHA standards, also seen it used to make a Beech AT-11 twin engine aircraft(bomber trainer) quieter inside. That stuff could be used on the underside of the plywood top covering the generator in the ground.
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Bill - The lead sheathed foam sound insulation sheets are also available from a marine application. IIRC from my sailing days it's sold in kit form to soundproof auxiliary engines on smaller sailboats. The major problem will be heat buildup inside the enclosure - the sailboat aux engines are water cooled. The bilge fan should work very well, just hook it to the 12V outlet on the generator with an in-line switch and turn it on as soon as you start the generator. I like marine appliances. The quality ones are built to survive serious abuse in a salt water environment which exceeds anything I expect them to face in my present circumstances. Anyone planning to include portable 12 volt power systems/appliances in their preparedness plans should seriously consider adding some marine power management books to their library; e.g. "The 12 Volt Bible" and "Living on 12 Volts". FWIW - Peregrino