How To Size Bathroom Ventilation Fan. Calculate the number of cubic feet in the bathroom by multiplying the rooms height x width x length in. The fan model its size and CFM rating or the required or design flow rate in CFM from your local code such as 60 or 80 CFM.
Length x Width x Height x 013 Number of CFM round up to nearest 10. In general for rooms with 8-foot ceilings. Bathroom vent fans are rated by the cubic feet per minute CFM of air they move.
For a standard 10ft by 10 ft bathroom with an 8 ft ceiling you will need an exhaust fan capable of 10667 CFM.
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