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Originally Posted by hawk
With a HRV , but not with a bathroom fan when the exchange, is, already heated drier air going out for cold, more humid air coming in. I agree a simple bf will help in many situations but not for all.
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The point I was making is that even though the outside air has a higher
relative humidity, it actually has less moisture in it. The term relative humidity refers to the amount of moisture relative to the temperature of the air. Cold air can't hold as much moisture as warm air so even though it would seem to be more humid it actually is less so. Calgary can actually reach near to 100% relative humidy in very cold temperatures, but trust me, it is still really freaking dry.
It is irrelavant how you are making the air exchange, the colder outside air still has less moisture. The bathroom fan will work, its just that you'll be pumping all your expensive heat out with it.