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Yes, my attic hatch-cover is allowing warm air to leak out of the upstairs. I just discovered that with a stick of incense. There is a bathroom fan up there as well. I'll seal them both up and see if it helps the situation. This fresh-air intake in the basement is a real problem, though...

Okay, I'll try the other link; thanks. My situation is the same as in the U.K., though. I have a fresh-air intake near the furnace, but I'm experiencing some problems I think may have to do with negative pressure. Is there an easy way to test whether you have negative pressure in your house...

I have a basic question: On my forced air gas furnace, if I run the fan alone (no heat), does it force some of my house air out of the chimney? Or would there be a damper stopping this from happening? Thanks.