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Question about push/pull config

L

lee0539

[H]ard|Gawd
Joined
Nov 17, 2001
Messages
1,827
I am planning to use gentle typhoon AP-15s as push and cougars as pull and was wondering if the cougars will be hurting the gentle typhoons if they are not pulling enough air out or does it not matter? Will this cause change in noise level? I would like to just do push or pull with GT AP 15s but the way it is setup and the screws i have i think i should just keep it as push/pull
 
I don't think it can hurt performance, especially if both fans were running at approximately the same speeds.

The Gentle Typhoon's performance is greatly lowered by the radiator. Adding pressure into the radiator by means of the Cougar means there is more air available for the Gentle Typhoon to pull, increasing the overall performance.
 
You should be fine. The only real issues would arise from using really mismatched fans. You wouldn't want a situation where the fans on one side were powerful enough to cause the other fans to become an obstacle to airflow or to be forced to run over their rated speed from the other fan pushing it so hard. You're very unlikely to have this issue with any of the more common fans.

You should be just fine setting up the fans you have like that. Gases (air in this instance) behave like fluids. When you use the push/pull setup, it's like lowering the flow resistance through a hose by having a suction on the other end while you're also pushing.

And don't think of it as the pulling fans are "pulling air out of the radiator". The pulling fans are creating an area of negative pressure that air flows through the radiator to try to equalize.
 
You could also use one pair of fans in one spot (e.g. if you have a 240mm rad mounted vertically you could put both AP-15s on the top part and cougars on the bottom part). That way you wouldn't have to worry if one fan matches the other. The only downside I can see is the looks.
 
If all fans are the same thickness do what koween suggested. It will prevent the speed mismatch you are worried about.
 
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