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does a fan shroud really help that much?

post #1 of 29
Thread Starter 
do fan shrouds really help that much and how? and is a push and pull setup unnecessary? i think it would make sense, but ive read around lately that its just more noise than is efficient
    
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post #2 of 29
Well, with a shroud if there is any resistence (which there usually is given you are typically trying to put more air through a HS) the "extra" air backflows out through the gap between the fan blades and the fan housing. Push/pull is ok. I have it on my Tower112 but I can't say for certain that it makes a big difference. It does follow though that if you are getting resistence from the HS that a push/pull will help as the pulling fan will "promote" flow through the HS by causing negative pressure.
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post #3 of 29
what it does also is gets rid of the dead spot in the middle of the fan and more evenly pulls the air through the fins.
    
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post #4 of 29
Quote:
Originally Posted by atomicfission92 View Post
what it does also is gets rid of the dead spot in the middle of the fan and more evenly pulls the air through the fins.
^Bingo. And if you're using high CFM fans, it's a must. Push pull, not so good IMO. Just get higher CFM fans and it will be just as good.
post #5 of 29
Yeah, It gets rid of the dead spot ,,,A fan's air flow kind of looks like a do-nut, a shroud helps to close the hole in the center...Most give about 3/4 inch off-set I think... I made mine out of 1/2" aluminum channel because that's what I had, seems to work OK...I just use mine in a pull config...
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post #6 of 29
Thread Starter 
thanks alot guys, i really didnt know why, my guess was to evenly move the air, but i wasnt sure, but the way you guys explained it cleared it up for me, thanks!
    
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post #7 of 29
Also make sure you dont have 2 fans fighting agaisnt eachother as it would be better to get a single fan with a better CFM rating.
post #8 of 29
Thread Starter 
what is CMF rating? is it the amount of air it pushes?
    
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post #9 of 29
Quote:
Originally Posted by obas View Post
what is CMF rating? is it the amount of air it pushes?
yes its cubic feet per minute
    
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post #10 of 29
While a fan shroud gets rid of the dead spot at the center of the fan, its real purpose is to channel the airflow through the fan blades to reduce turbulence and direct a straight path of airflow.
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