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Insulating furnace supply plenum -- what materials?
The only part of our high efficiency gas furnace system that is "leaking" significant heat appears to be the (uninsulated) sheet metal supply plenum.
I would like to insulate it and was wondering what types of insulation would be best?
My initial thought was to use some type of foil-backed rigid foam insulation like the type available at the big box stores.
But I want to make sure that there are no general safety or code issues determining the insulation type given that it is near the furnace.
(Also, of course, I will be monitoring basement temperatures to make sure it doesn't do too good a job of keeping heat out of the basement...)
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