Short answer: ceiling-mounted extractor fans are usually more effective — but there are cases where wall-mounted wins. Here’s the clear breakdown:
Ceiling-mounted fans (generally best)
Why they work better:
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Steam rises, so ceiling fans grab moisture right where it collects
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Better at preventing condensation, mold, and peeling paint
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Can vent straight up into the roof space and out, which often means shorter duct runs
Best for:
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Showers/baths that create lots of steam
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Modern bathrooms with a ceiling above
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When you want maximum moisture removal
Wall-mounted fans (situationally good)
When they make sense:
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Bathroom is on an external wall
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You want direct venting outdoors (no long ducting)
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Ceiling mounting isn’t possible (concrete ceilings, apartments, heritage buildings)
Downsides:
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Less effective at grabbing steam that’s already risen
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Can leave moisture lingering near the ceiling
🏆 Verdict
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If you have the choice: go ceiling-mounted
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If the wall fan vents directly outside and the ceiling one needs long ducting: wall-mounted can be just as good or better
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