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determining air flow direction of a fan..

post #1 of 31
Thread Starter 
how?

i don't see any markings on any of them

does the side of the fan that has the power connector on it determine it or anything?
post #2 of 31
usually the sticker side means exhaust. Take a paper and see which side sucks the paper in rather than push it out.
post #3 of 31
The absolutely sure-fire way without turning on the fan is to judge based on concavity and convexity.

The concave side will exhaust. The convex side will intake.
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Taijin Kyofusho
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post #4 of 31
I hope this makes sense:

The side of the fan on which the middle/round part that houses the motor, if that side is facing toward you, then the air will be blown away from you. The side that doesn't have the motor cover is the side that it will push the air out.
post #5 of 31
Quote:
Originally Posted by jach11;12523490 
usually the sticker side means exhaust.

^this

never encountered a fan where this wasn't true

:edit:
sticker side is the one with the "struts" going to the center of the fan
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post #6 of 31
Most fans I've come across have two arrows on the side, one indicating rotation direction, the other indicating air exhaust direction.

Failing this, you could just plug it in and turn it on, the side you feel air being pushed on is the exhaust side...

Or sometimes the sticker on the hub is on the exhaust side.

Or, as faraz said above, concave = exhaust side
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post #7 of 31
Usually there is a small arrow. blades are a tell tail sign.
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post #8 of 31
the side with the 4 supporting things that come out from the middle is the exhaust.



ex:

gentle_typhoon_1.jpg

you see the 4 supporting things that come out? that's the side that air blows to ( exhaust )

41u8JR3bCaL._SL500_AA300_.jpg

the side that doesn't have the 4 support things = intake like the above image shows
    
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post #9 of 31
trial and error.
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post #10 of 31
sticker side...almost always exhaust.

the side that has no struts/grill protecting the fan blades is usually intake.
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