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Thread: Bad airflow with this fan grill?

  1. #1
    Snee's Avatar Error xɐʇuʎs BT Rep: +1
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    Just mounted this today, replacing a lounder 80mm fan and a caseblower with two quieter fans (one 80mm on the inside, blowing into the radiator and this 120mm pulling out behind it).


    click it for a bigger pic

    I need a grill, 'cos there are sometimes dogs visiting. I don't want any little noses getting stuck in the fan or anything.

    The question is how much I'd gain by getting a standard grill ( ), as I think this one stops a bit of air from passing through.

    Is it worth looking for a new one (I know they are dirt-cheap, but I have to order them as I can't find any place that carries them locally for some unfathomable reason, and the freight costs more than the grills themselves), are we talking a hugely improved airflow with a standard fan grill here?
    Last edited by Snee; 03-26-2005 at 09:16 PM.

  2. Software & Hardware   -   #2
    TheDave's Avatar n00b
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    i couldnt imagine it having much effect. could you analyse the fan speed and temperature?

  3. Software & Hardware   -   #3
    Snee's Avatar Error xɐʇuʎs BT Rep: +1
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    Well, I guess I can run it without any grill at all for a bit, and I'll prolly have to switch it back and forth before I'm sure. (I don't have the other to test with so this would mean that I expected the other grill to not be an obstruction at all, which I'm not sure of.)

    Was wondering if anyone had tried one of these before or so. Might save me a couple of reboots. And it's getting colder pretty rapidly just now, so I don't think I'd get the best results. Fooking hot today, 'til the sun went down.

    I know some other spiral shaped ones do screw up airflow, but I don't know about these.



    Another thing is that the 120mm fan isn't showing up in mbm (I know it's working). Dunno' what's the matter there, works fine in bios.
    Last edited by Snee; 03-26-2005 at 10:11 PM.

  4. Software & Hardware   -   #4
    Virtualbody1234's Avatar Forum Star BT Rep: +2
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    I use those:

    I think it would be worth the effort to get it.

    Test it without a grill to see how the airflow changes and if it's quieter.

  5. Software & Hardware   -   #5
    Snee's Avatar Error xɐʇuʎs BT Rep: +1
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    'k will do tomorrow.

    The freight-cost will be annoying if I order them, but if it's better, it's worth it.


    EDit: hmm, I wonder how tricky it'd be to drill holes all the way round the one I have to improve airflow and decrease surface that way.

    'cos if I got it right it'd look pretty cool.

    Prolly way too tricky.
    Last edited by Snee; 03-26-2005 at 11:56 PM.

  6. Software & Hardware   -   #6
    Virtualbody1234's Avatar Forum Star BT Rep: +2
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    If you start drilling you need to remember to keep it structurally strong.

  7. Software & Hardware   -   #7
    Snee's Avatar Error xɐʇuʎs BT Rep: +1
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    Will do, if I try. Thanks for the reminder.

    Now I can't even find regular 120mm fan grills online, in this country. Pitiful

    Well, now I could, but they had no information about shipping or anything.
    Gonna' look in the city, might be somewhere I missed.
    Last edited by Snee; 03-27-2005 at 12:04 AM.

  8. Software & Hardware   -   #8
    Virtualbody1234's Avatar Forum Star BT Rep: +2
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    Quote Originally Posted by SnnY
    Will do, if I try. Thanks for the reminder.

    Now I can't even find regular 120mm fan grills online, in this country. Pitiful
    That sounds strange to me. There is a local store that has those not far from me. A large electronics wholesale outlet. I even have some in my own stock.

  9. Software & Hardware   -   #9
    Snee's Avatar Error xɐʇuʎs BT Rep: +1
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    Your country is slightly bigger than mine

    Small market I guess.

    Not the first time I've had problems getting hold of parts that you'd think would be available everywhere.


    Great, found another site that had it, overcharge much? nah, only three times what it's worth.

    Meh, the city it is.
    tried every store in the City proper, but maybe there's something in the periphery.
    Last edited by Snee; 03-27-2005 at 12:22 AM.

  10. Software & Hardware   -   #10
    fkdup74's Avatar Pneuberator.
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    lookin at it from a kind of extreme perspective....
    i'd say the the normal grilles would be better,
    as your current grille has flat surfaces,
    possibly deflecting air back towards the fan
    if anything, creating turbulance, hence noise
    true, the surfaces arent huge in area,
    but it could make a difference
    the normal grilles' surfaces are rounded, more aerodynamical if you will

    i just cant believe its that much of a pain to obtain them

    -edit-
    as for the drilling idea...
    dont know if it would be worth it
    yeah, you may relieve some of the "deflection",
    but as VB pointed out, you will weaken the integrity somewhat,
    and possibly create a whistling effect or something ,
    or maybe a rattling from the weakened grille
    Last edited by FKDUP74; 03-27-2005 at 02:17 AM.

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