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We have a double garage with a high ceiling which is also where our laundry is.

We have a problem with humidity in there due to the clothes dryer being in there which is used very regularly.

This is resulting in mould on the ceiling, and my tools going rusty.

We bought a dehumidifier and if that runs all day it extracts a lot of water but still doesn't seem to be able to keep up. Leaving the window open doesn't make any difference and even if I leave the garage door open for half an hour it doesn't help much.

I want to know if I add an extraction fan in the ceiling that draws air into the roof space is that likely to make any difference.

Also, if extraction fans draw the moisture into the roof space will that cause humidity problems in there instead?

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    Is it possible to extend the exhaust vent of the dryer through an outside wall? – Solar Mike May 20 at 9:10
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    Agreed. You need to vent the dryer to the outside. Blowing that moisture into the attic will cause mold and rot in your attic, possibly water damage on your walls and ceilings when it condenses, and may eventually cause roof damage. As a plus, venting the dryer outside can shorten your drying time and save some energy ($$$). – Eric Simpson May 20 at 9:31
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    Where does the dryer vent out to and is it a condensing type? – ratchet freak May 20 at 9:52
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    You need to get the moisture out of your building, and the best way by far is to vent it directly out. Otherwise, You Will Have Problems. – Daniel Griscom May 20 at 11:11
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    Aren't Australian dryers vented in the out back? – DrMoishe Pippik May 21 at 2:16
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You need to vent the dryer to the outside. Blowing moisture from your dryer, or bath vent, into the attic will cause mold and rot in your attic, possibly water damage on your walls and ceilings when it condenses, and may eventually cause roof damage. As a plus, venting the dryer outside can shorten your drying time and save some energy ($$$).

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