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ghostridur t1_j9w5zki wrote on February 25, 2023 at 12:05 AM

If it is an attached garage which I imagine it is, you can't have a duct through the fire wall that is open to the garage. Also you could be negative drafting the water heater and furnace which is really bad news.

allangee t1_ja1dtqr wrote on February 26, 2023 at 2:51 AM

And increase the pressure in the garage forcing that air into the house.