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# bathroom vent

#1
06-28-05, 07:49 PM
Member
Join Date: May 2005
Posts: 54
bathroom vent

hi folks
what is the recommendation for size of exhaust fan in bathroom in relation to square footage of the bathroom?
thank u

#2
06-28-05, 07:58 PM
Member
Join Date: Jul 2003
Location: N.E. Arkansas
Posts: 7,813
Get the highest volume fan you can afford. You are talking moist air here and the quicker you can get it out, the better. I realize that some are noisier but you want volume. Good luck.

#3
06-29-05, 06:43 AM
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Join Date: Oct 2004
Location: USA
Posts: 322
Fans are rated for CFM, cubic feet per minute of air moved.

Get one rated for your size bathroom, or bigger.

That's the length x width x heigth of your room (measured in feet)

#4
06-29-05, 12:27 PM
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Join Date: May 2005
Posts: 54
my bath is 5' wide x 12' long x 8' high.

#5
06-29-05, 12:40 PM
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Join Date: Jul 2003
Location: N.E. Arkansas
Posts: 7,813
If my math is still okay thats 480 Cubic Feet.

#6
06-29-05, 01:19 PM
Member
Join Date: Apr 2003
Location: USA
Posts: 1,024
From the Broan website:

Bathroom fan sizing:

For an 8 foot ceiling, take the square footage of the room, multiply it by 1.1.

For any ceiling over 8 feet, take the height of the ceiling and multiply by .1375. Take this figure and multiply by the square footage of the room. This will equal the recommended CFM's. (Example- 10' x 12' room with 10' ceilings. 10' x .1375 =1.37 x 120 square feet = 164 CFM's.)

Both calculations will give you the minimum recommended CFM.

#7
06-29-05, 01:30 PM
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Join Date: Aug 2002
Location: Mountain Williams Missouri
Posts: 18,386

My books all show the cfm for the fan as to just sq ft of the bath is all. So like a 45sq ft bath needs a 50 cfm 55 sq ft bath needs a 60 cfm fan. As you have a 5'X12' == 60 sq ft Id go for a 70cfm .

ED

#8
07-01-05, 01:05 PM
Member
Join Date: May 2005
Posts: 54
thanks 4 the help friends