Fan orientation

[vwguy16 0]

So last night a print failed and it managed to fill the area between the two side fans with pla.

So I took the plunge and took the hot end apart completely. After a few hours of cleanup I'm ready to put it back together but I failed to take a picture showing the orientation of the middle fan....there is a sticker on one side and I'm kinda thinking that should be on the outside...but can anyone help me out with the direction the air is supposed to go? Is it supposed to blow cold air into the mechanism or is to pull hot air away?cheers

[tinkergnome 927]

Assuming that you are talking about an Ultimaker2(+):

It is supposed to blow cold air from the back to front. The sticker faces against the heat-sink.

See "Assembly Manual" (page 51)