your exhaust should be slightly ( within 10%) bigger to keep pressure negative, to naturally draw air in. Positive pressure should only be used when controlling temps.
4x5 Reviewed by 4x5 on . Computer fans for cooling A few questions... :o 1. Does the intake fan have to be the same size as the outtake fan? 2. If the fan is a decent make (Arctic Cooling) can it be left on 24/7, or should I get 4 fans - two intake and two outtake, and have them on alternately? 3. My closet is 2.5ft wide, 5ft high (250w HPS hanging down 2 foot above the ground though with reflector) and 2.5ft deep. What size/diameter fan should I get, and what RPM should it run at? The temp is fine at night because I have a fan blowing Rating: 5