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 Post subject: electric fans
 Post Posted: Fri Feb 09, 2007 5:58 pm 
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heres my new question for the day, 10" electric fans, have two of them, want to use them as pushers. mounted on raditor and hooked up blue to + and black to ground and was pulling, have seen were some rreverse blades, but have heard some reverse wirring. I tried reversing black to + and blue to ground and it does push. My question is this will they both work just the same, is them little motors designed to turn either way or does it work better, pushes more air one direction only and the proper way to change direction is by flipping the blades over

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 Post Posted: Fri Feb 09, 2007 6:24 pm 
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Flipping the blades over will not reverse the air flow. The fans that are reversible have to be wired to change the rotation AND the blades must be flipped over. The blades have a contour that is more efficient when they are installed properly.

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 Post Posted: Fri Feb 09, 2007 7:19 pm 
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so when I change wires around and the fan changes directions which it does, does it matter and is it just as good in either direction

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 Post Posted: Fri Feb 09, 2007 7:29 pm 
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No Chuck said to flip the blade on the motor if possible, if I understood him.


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 Post Posted: Fri Feb 09, 2007 8:07 pm 
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spib wrote:
so when I change wires around and the fan changes directions which it does, does it matter and is it just as good in either direction
So I will ask like above one more time if black is to ground and blue is to positive and it pulls air, and then I switch wires black to positive and blue to ground and it pushes air, which is what I want. IS the electric motor on the fans designed to flow the same cfm in either directions wired either way? that is my question

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 Post Posted: Fri Feb 09, 2007 9:02 pm 
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gearhead1011 wrote:
The blades have a contour that is more efficient when they are installed properly.


What Chuck said

What kind of fan do you have? Is it a push/pull type or a factory pull type?


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 Post Posted: Fri Feb 09, 2007 10:49 pm 
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Sorry I didn't reply sooner, I been working on putting my motor back together. When you posted your question I assumed you had a couple of after market universal fans. Most of these are designed to work in both directions. If that is the case you reverse the wires to change directions. These motors will run just as well in either direction. The blades are curved to move the air better and when you reverse the direction you also flip the blade over. For this type of fan to work right you have to do both. If they are direct fit factory fans usually they don't work well if you reverse them.

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 Post Posted: Fri Feb 09, 2007 10:53 pm 
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Try it. If it keeps the motor cool then it flows enough. It depends a lot on blade design. If it just the standard blades you should be fine. The "S" type blades won't work as well if spun backwards.

George


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 Post Posted: Fri Feb 09, 2007 11:36 pm 
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they are aftermarket 10" fans with straight blades, dont know the brand

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