Air sealing/insulating after fresh air intake removal
As some of you may remember from previous discussions, we had a ducted heat pump put in last summer, replacing a gas furnace and making use of the old ductwork. Today the installers came back and took out the fresh air inlet that went from an outside wall to the return duct, on the theory that it was no longer needed and was just making the house more difficult to heat.
They left the outside bit of the inlet in place and capped it off on the inside. I’m assuming this leaves a thermal bridge as well as actual air gaps around the pipe. What’s the best way to seal up/insulate this area? I’m not specially keen on paying to redo any siding, and I don’t mind the look of the vent on the outside (and the inside look doesn’t matter much, as the basement is unfinished — though I think I’d rather not have just a big blob of Great Stuff on the wall).
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