Quote:
Originally Posted by Ryan7
House has no furance, radiant heat with boiler, 20 year old house.
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If the boiler is gas fired (as opposed to electric) it still requires combustion air and has a chimney. Negative pressure in your home (from too many or too large of bath fans, dryers, kitchen fans etc) will suck air that is trying to be vented from your boiler into your home. That air, once burned 2X creates carbon monoxide, deadly.