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Old 09-11-2008, 10:32 PM   #1
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Bathroom fan


What CFM is the most appropriate for a bathroom? I see as low as 50 and as high as 130...

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Old 09-12-2008, 04:23 AM   #2
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How large is the bathroom?

Is there a tub or shower present?

Are there any windows that can be opened?

I prefer at least 80 CFM in any bathroom that has no windows available for ventilation.

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Old 09-12-2008, 09:51 AM   #3
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The lower CFM fans are often ineffective at removing humidity during a shower, and aren't very effective at dealing with poo smell in short order.

Personally, I'd opt for a stronger fan regardless of the size of the restroom.
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Old 09-13-2008, 03:06 AM   #4
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80 CFM is the smallest one I useally used but 90 or 110 or 120 CFM is the most common and yeah there are some larger unit but not often used unless it in monster sized bathroom.

Merci,Marc
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Old 09-15-2008, 10:42 AM   #5
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My 2-cents worth...

Our very small bathroom (with no windows) has a new 80 CFM fan...supposedly fine, but it is totally inadequate for defogging during a shower, and it takes a long time to refresh the air from odors. It's also way too noisy. I would not recommend it for a bathroom that will have regular use!

Replacing that fan with a stronger one is one our to-do wish list!
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Old 09-15-2008, 04:25 PM   #6
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Bathroom fan


A bathroom fan is only intended to remove the vapor from showering washing hands etc. It is not intended to remove odors from certain bodily function although that is a big misconception. It doesn't help that they have been termed fart fans.
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Old 09-15-2008, 04:48 PM   #7
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Fart removal is a benefit of having them.
(at least in my house)
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Old 09-15-2008, 08:34 PM   #8
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And remember that a replacement air source, such as the space under the door, must have the same cross sectional area as the exhaust pipe for the fan.
Of course, if you are using forced air heating, its not a problem.

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