Should the fan blow onto OR suck air from the heatsink?

[Quad]

which direction should the fan face?
blowing down onto the heatsink? or sucking air away?

thanks for the help

quad

 

[Tschaft]

Ive got mine blowing onto it. But im not sure which is best.

 

[max105]

mine is blowing into the heatsink...i heard somewhere that it cools a little better, but I'm not positive if this is always the case.

 

[Jhhnn]

In general, the fan blows air into fin-type sinks, and out of pin-type sinks. The Alpha pep66 is an exception, following their usual practice of blowing the air out but with a unique cross-flow fin-type sink.

 

[Mykex]

Heatsinks that are made to use impellar(sucking)driven cooling all have a cowl to direct the inflow to the lower section of the HS.

 

[Cologinbob]

i have a 120mm fan cut into the side panel blowing on(in) the add-on cards and cpu, on a full size addtronics case, with 4 40mm fans and 2 80mm fans blowing out. might seem like overkill but it works great. a rule of thumb is that positive air pressure gets less dust into the drives than negitive. Get an thermometer and try different fan configurations.

 

[hubbs]

There is no answer

Some heatsinks like it one way and some the other way.....You just need to experiment

 

[Vyle]

Blowing and sucking? Isn't it the same thing.

 

[Rock8713]

Blowing down is the standard.

Lou

 

[rearvu]

mine runs about 3c hotter blowing into the hs...hsf is a FOP38...

 

[Lawton]

How about having one fan pushing in and the other pulling out (in a two fan cooling situation). That would really move some air, eh?