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The heating duct was clearly originally intended to heat the dining room because it was boxed in by drywall on both sides of the frame and a 2x4 between the studs about 12" above the floor. Someone had poked a hole (about 4" x 4") in the drywall on the backside of the wall before covering everything up on the front. I guess this was his solution to a problem with freezing pipes, judging from the extent of water damage in there. If I divert the heating duct to the currently unheated garage which, as discussed in a previous post, I want to convert into a shop, I want to be sure that that I don't recreate the original problem. The winter temperature here can go as low as -40. I'll make the repairs as you suggested, but how do I spray foam around the piping and in the wall space? Or do you mean, fill the entire space with foam? Also, I was wondering about replacing that drywall that I've removed at the bottom of the dining room wall (9' long x 16" high) with a grill so that the house air could warm that space. Would that be okay? Or, would that just let too much heat escape from the house?
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