Home Forums Tech Helproom CPU cooler fan - blow on to heatsink or away? Tech Helproom | Windows Help | Apple Help | Digital Home & Smartphones Help | Consumer Rights Advice | Games | Speakers Corner | Beta Testing Forum Rules | Contact Forum Editor | Report a Post CPU cooler fan - blow on to heatsink or away? Bailey08787 13:14 07 Sep 2009 Locked Hi thereIn the midst of a new build and added a cpu cooler to my cpu last night.Then it struck me that I wasn't sure whether the fan coupled to the heat sink is either:a) intended to blow air on to the heatsink to cool it downor b) spin so that it takes hot air away from the heatsink, into the case, out through case exhaustI'm thinking b), but just thought I'd check I am Spartacus 13:18 07 Sep 2009 Blowing down seems to be more effective. It also cools the VRMs as well. Ashrich 13:22 07 Sep 2009 I believe they blow on to the heat sink , the other way would only benefit if a cowling was fitted over the heatsink first ( like some Dell desktops ) Ashley Fruit Bat /\0/\ 13:22 07 Sep 2009 mine blows air away from the heatsink. Fruit Bat /\0/\ 13:23 07 Sep 2009 and yes it has a cowling Bailey08787 15:33 07 Sep 2009 when you say 'down', you mean in the direction of the heatsink yes? I am Spartacus 17:26 07 Sep 2009 Yes, blowing through the heatsink. GaT7 17:58 07 Sep 2009 Similar post here - Should the cpu fan blow towards or away from it? click here.I'd say the 'best' way might depend on your setup, case cooling, etc. So it may be worth trying them both to see what works best for you. Use a tool like HWMonitor to check temps click here. G This thread is now locked and can not be replied to.