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I’m in Michigan. And our builder told us that the fresh air was put in because our house was air tight….and to never block it (for combustion air). We also have a couple of continuously running (on low speed) bath fans (one of main and on second floor) that supposedly help to keep air...

I don't know about the exact size of the existing hole - it's behind a horizontal ceiling joist so not visible from any angle - I probably will not know until they take of the little vent cover outside to seal it off with foam. I thought it was crazy to bring in cold air from outside too, but...

That room has a natural gas burning water heater and a furnace. The furnace has the intake and exhaust connected directly to it. The water heater has a directly connected power vent to exhaust.

We are finishing our basement soon, and up until now our builder had just put in a vent on the outside of the house that allowed air to just pour in through an area in the rim joist (no pipes/ducts) and there was an orange sticker that said never to block or close off that air supply. But now...

I know this is an old old post, but I have a question along the same line as the original question. We are finishing our basement soon, and up until now our builder had just put in a vent on the outside of the house that allowed air to just pour in through an area in the rim joist (no...