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Exhaust Fan Calculator


Exhaust Fan Ventilation Calculator
 Length of Greenhouse - in feet
 Width of Greenhouse - in feet
 Height of Greenhouse - in feet
    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.