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Re: Bathroom Exhaust Fan
For a while, some areas allowed the use of a recirculating fan with a charcoal filter.
I never could figure out why, nor the purpose of the charcoal filter, nor who would be there to make sure that the charcoal filter would be replaced when required (or, for that matter, even still be made a number of years later).
As I discussed this with the various mechanical inspectors in the area who allowed it, they realized what I had, what did it actually do versus what it was intended to do (remove moisture). Eventually, I think that allowing those was discontinued and the code for "exhaust" was enforced.
I suspect the problem started with the trades people referring to bathroom exhaust fans as "fart fans" for so many years that people began to think that was the reason for them, and, yes, the charcoal filter would absorb must of the 'odor' (hence "fart fans"), but what about when the charcoal filter was toast, or no longer available?
Regardless, "fart fans" eventually were replaced with "exhaust fans", which is what they started out being in the first place.
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