What does 'one air change per minute' mean?

It means the fan should be powerful enough to replace the entire volume of air inside the greenhouse with fresh, cooler air from outside every 60 seconds. This is a standard recommendation for effective summer cooling.

Do I need one big fan or multiple small ones?

You can achieve the total required CFM with a single fan or multiple smaller fans. Using multiple fans can sometimes improve air circulation. For example, if you need 4000 CFM, you could use two 2000 CFM fans.

Where should I place the exhaust fan?

For best results, place the exhaust fan high on one wall, and have an intake shutter (of equal or larger size) on the opposite wall near the floor. This creates a cross-breeze, pulling hot air out from the top and drawing cool air in from the bottom.

Greenhouse Cooling Calculator

Calculate the required fan capacity (CFM) for greenhouse cooling.

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