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

[Quad]

should it blow onto the heatsink, or suck air away?

thanks

quad

 

[jawaki]

Depends on the heatsink.
The PAL6035 sucks air away from the heatsink and alomost all others blow air onto the heatsink.

 

[amdskip]

FOP32 blows in

 

[twong82]

most fans blow air onto heatsink