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RE: Bathroom much is enough? (Follow-Up #1)

posted by: lazypup on 12.18.2010 at 12:07 am in Bathrooms Forum

Bathrooms should have four complete air exchanges per hour.

First you have to determine how much air you need to move. To do so compute the volume of the room in cubic feet then multiply room volume by the number of air exchanges desired per hour.

(Length x width x height ) x 4 equal total cubic feet of air per hour.

example: for a room that is 10 x 10 with an 8ft ceiling it would be 10 x 10 x 8 = 800cu.ft of room volume.

for four exchanges per hour is would be 800cu.ft x 4= 3200cf/hr.

Most fans are rated in CFM

To convert the total cubic feet per hour to CFM divide by 60

example.. 3200cubic feet hour / 60min/hr = 53.3cfm (54cfm).

You would then need a fan that is rated equal to or slightly greater than 54cfm.


Bathroom ventilation
clipped on: 01.10.2011 at 12:33 am    last updated on: 01.10.2011 at 12:49 am