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  1.     
    #1
    Senior Member

    Computer fans for cooling

    A few questions...

    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 cool air on me while I sleep, but during the day its running between 27 and 31C
    4. A 12v computer fan can be wired up to the mains, am I correct? If so, I can look up on Google on how to do this
    5. Intake fans run level with the plants, whilst outtake fans run just above the light - yes or no?

    Cheers for your time peeps
    Tom Swierzbinski Reviewed by Tom Swierzbinski 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

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  3.     
    #2
    Senior Member

    Computer fans for cooling

    I can't help with all of this but here goes.
    I leave my computer on 24/7 and I haven't lost a fan yet. As for wiring it to the mains, I bought a 12v adpter thing with the right ampage and wired it straight in. The adapter has settings from 3.5v to 12v so if I want the fans running slower I just move the switch.
    Outtake fans should be @ the highest and intakes @ the lowest I think but I could be wrong.

  4.     
    #3
    Senior Member

    Computer fans for cooling

    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.

  5.     
    #4
    Senior Member

    Computer fans for cooling

    and a 12v dc adapter reted for 1amp will run 4-5 12v 80mm PC fans. intakes at the bottom of room (coming from other room/outdoors), exhaust at/near ceiling (exhausting into attic, piped somewhere else...), extra fans for movement between plants and lights.

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