Reply by jayscott

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Posted on Air cleaner fan flow reduction

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19 posts in 2523 days

#1 posted 04-01-2012 03:11 AM

Well, I tried a number of things with not the best results so I thought I’d report in.

1) I did manage to turn the direct drive fan cage around and get the set screw tightened but the fan vibrated at high, low, and medium speeds. Turning the cage back to the correct orientation, the vibration stopped and the fan run smoothly. I guess they are not designed to run backwards.

2) When I did close off the inlet enough to get the flow I wanted, the direct drive fan vibrated so much I couldn’t use it.

3) I turned the cage on a belt drive fan backward and it runs smooth as silk. The flow was still higher than I wanted but I could live with it if it was all I had. I can also change pulley sizes to adjust the flow to reasonable levels.

4) During all the testing, I found a 10” 1500 rpm propeller blower. I installed it in the box from the first trials and it seems to be working quite well. I’ll stick with it for a while.

Thanks for all your help.

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