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There are a couple of ways. Are you comfortable when it's really hot or cold outside? If so, then it's sufficient. Do a Manual J heat load calculation. You can do a crude approximation of this yourself using http://www.loadcalc.net/ Use "rules of thumb." These rules depend heavily on your area and become less accurate the better or worse your house's ...


Can you do this? ABSOLUTELY NOT!! Aside from (likely multiple) code violations you will never filter the lint out and will create a dangerous situation inside the furnace plenum, aside from clogging the furnace filter probably weekly.

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