Greenhouse ventilation volume is based on a specific formula related to the greenhouse dimensions no matter what your plant types and climate zone are. Although it may seem complicated, choosing the right shutter exhaust fans for your greenhouse cooling system does not require complex mathematical formulas or difficult calculations，to find out how many CFM(cubic feet per minute) do you need for greenhouse and how many exhaust fans you need for your greenhouse, only one  simple greenhouse exhaust fan calculator tip is all that’s needed. We’ll show you how to do them below.

First, Calculate Total CFMs for Greenhouse Exhaust Fans

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