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Exhaust Fan Ventilation Calculator
Length of Greenhouse - in feet
Width of Greenhouse - in feet
Height of Greenhouse - in feet
W' x L' x H'
Fan CFM Needed - This is the optimal exhaust fan CFM (Cubic Feet per Minute) rating for your greenhouse. A fan this size will exchange the air in your greenhouse one rate per minute which is the recommended ventilation for most small greenhouses.
Choosing Shutters
Exhaust fans require 18 inches (324 sq. in) of air intake area per 1000 CFM to function properly.

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