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Cell54 Reviewed by Cell54 on . Air Ventilation QUESTION (please READ) Fresh air to plants whatever species they are is extremely important for healthy growth!!! For fresh air ventilation I have a 6 inch circular booster fan that fits in between flexible aluminum ducting. (It is meant to be used with home central air conditioning. Placed within the air ducting it boosts the cool air up your vent ducts in your house to better cool the upper floors.) Since the ducting I was already using for my 185 cfm blower for exhaust is 4 inches in diameter planned to use Rating: 5