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Is it possible to use a dehumidifier instead of a bathroom fan for keeping the bathroom dry? Is it possible at all to dehumidify the room rather than extracting the moist air from the room?
 

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I actually did use a dehumidifier, though in conjunction with a fan. The fan was pretty anemic, though, which is why I supplemented with the dehumidifier. After replacing the fan with a much more powerful one, the dehumidifier never actually seemed to collect any water.
 

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Is it possible to use a dehumidifier instead of a bathroom fan for keeping the bathroom dry? Is it possible at all to dehumidify the room rather than extracting the moist air from the room?
Yes it is possible, but if you've just showered and the air is 100% saturated with moisture, it is much more effective to just get rid of that air and pull in fresh air with a fan.
A dehumidifier would work, although more slowly and requiring more energy to extract the moisture from the air.
 

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A dehumidifier would work to remove moisture but would not negate code required fans and/or operable windows. Fan sizing is based on the number of sanitary fixtures. Toilet rooms without bathing facilities are required to have ventilation. Those imply that ventilation requirements are intended primarily for removing odors.
 
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