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cooling fan

Discussion in 'Electronic Basics' started by lerameur, Jan 31, 2007.

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  1. lerameur

    lerameur Guest


    I have a module which requires a heatsink. I want to add a fan about 3
    inches away. My dilmena is this. Should I be blowing air on the heat
    sink, or should I be blowing air out of the enclosed module. I made
    hole all around so there is a breathing space.

  2. Jamie

    Jamie Guest

    have a vent that cool air can be brought into, pull air out
    across the sinks. the intake should have a filter.
  3. Rich Grise

    Rich Grise Guest

    Depending on what kind of heat transfer you need, if you don't have any
    ducting, I'd blow the air from the fan towards the heatsink. If you try
    to suck the air away, a lot of it could miss the heatsink, unless, like
    I say, you've got some kine of ducting.

    A dust filter on the intake side of the fan would do no harm. :)

    Good Luck!
  4. Puckdropper

    Puckdropper Guest

    I agree, blow the air where you want it to go, don't suck it away.
    ....until it clogs. Your fan may have to work harder when the filter's
    dirty (depending on where it is) which may shorten its useful life.
  5. John  Larkin

    John Larkin Guest

    Hard to say, without knowing how much cooling you need. But the best
    thing would be to have the fan intake cool air from outside, blast it
    directly onto the heatsink fins at close range, and allow the heated
    air to escape through vent holes.

    The reverse would work almost as well: Have the fan exhaust air from
    the box, and place the heatsink very near or in the only intake port.

    Either way, you'd be forcing cool air through the heatsink fins. Given
    a chance, air prefers to flow *around* the fins, so don't give it a
    that option.

    As Rich points out, you can blow air some distance directionally, but
    you can't suck air directionally.

  6. Eeyore

    Eeyore Guest

    It all depends on the route the air takes ( backpressure ).

    Sometimes it's better to blow, sometimes to suck.

  7. lerameur

    lerameur Guest

    Ok so I gues i will be blowing.
    I dont have a filter, just a metallic grid on the cover.

  8. Rich Grise

    Rich Grise Guest

    Puckdropper mentioned that a filter will have to be changed,
    but I guess I'd rather periodically change filters than fix
    the equipment when the heatsink itself loads up with dust. :)

    I had that happen to a computer the CPU heatsink was totally
    clogged with dust, and the fan was stuck. The 'puter was
    erratic. I replaced the fan, blew out the heatsink, and it
    works fine now. :)

    Then again, I run my computers with the side panel completely
    off, bypassing any filtering.

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