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yup its a big problem......
Chimney or vent stack.
The door. Does your apt have a sliding one? If your apt does not have a chimney then you would need to serious consider the vent stack as Mr. J. suggests. If you do have a chimney and no cover for it, close the damper.
Jay
Unused or old dryer vents, old heater vents, any opening into the attic or crawl space, etc. Look everywhere and think like a bird!
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Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them