Can I exhaust my fan into my attic instead of out the roof or wall?

Yes, provided it is protected by a Ground Fault Circuit Interrupter (GFCI). Keep in mind, however, that any ventilation device located in a damp environment may have a reduced life due to high humidity and a potential for corrosion. Fans used in high-humidity areas should be operated for longer periods of time, to ensure the removal of moisture and to reduce the potential for condensation in the fan body or ducting.

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Yes, larger diameters will result in improved performance.

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If windows and mirrors are very cold, condensation can still form on these surfaces. And if your bathroom is sealed tightly, replacement air may not be entering the room fast enough to displace the moist air. Be sure to undercut your door sufficiently to draw fresh air into the room. Fan placement can also be a factor.Your fan should be located far from the replacement air source to ensure the mois...

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    The Home Ventilation Institute recommends that a fan should be left on for 20 minutes more to clear humidity adequately and to ensure moisture and condensation in the fan body or ducting is minimized.

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No. Since these are normally sealed chambers, a vacuum will be created.

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