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Author Topic: Exhaust Fan Type?  (Read 981 times)

Offline Willie Johnson

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Exhaust Fan Type?
« on: August 17, 2011, 08:53:25 AM »
I am in the middle of organizing and upgrading my workshop.  I can't get anything done in the previous setup.  I want to do some dope spraying and with fall and winter coming up, I will need to do this inside.  I noticed some of you are using exhaust fans.  I have been pricing explosion proof fans at $500+.  Before I save up and made that investment I thought I would ask what type of fan everyone else was using?

Thanks,

Willie
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Offline Mark Scarborough

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Re: Exhaust Fan Type?
« Reply #1 on: August 17, 2011, 09:43:07 AM »
Willie,
I have used a squirrel cage fan with reasonable success in the past. You want one that is belt drive preferably, then you can isolate the motor from the airstream of volatile vapors.
I have used standard old box fans, but BUT BUT that puts the motor directly in line with the flow of explosive materials and isnt a good idea.
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Offline Will Hinton

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Re: Exhaust Fan Type?
« Reply #2 on: August 17, 2011, 10:25:43 AM »
I ran across a full-house attic exhaust fan for fifty bucks years ago that I installed in the wall of my "dirty" shop.  It really does the job.  However, it isn't explosion proof as far as I know.  I mainly use it for dust removal while routing, sawing, etc., but must confess I also use it for painting.  (Fingers crossed!)
I had a furnace fan before, and it worked quite well, and is explosion proof.
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Offline Randy Powell

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Re: Exhaust Fan Type?
« Reply #3 on: August 17, 2011, 10:48:12 AM »
I use a set of two attic fans mounted in a frame that fits in the window of my shop. I open the door, turn on the fan and air is drawn from the door and out the window. I do have to clean the fans after painting, but it seems to work pretty well.
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Offline Peter Nevai

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Re: Exhaust Fan Type?
« Reply #4 on: August 22, 2011, 02:00:16 PM »
Just about any brushless AC motor is good. Nothing inside to cause a electrical spark so nothing to go Boom. Make sure it does not use a mechanical start although most use a starting CAP nowadays.
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Offline john e. holliday

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Re: Exhaust Fan Type?
« Reply #5 on: August 25, 2011, 05:25:12 PM »
I think in my opinion if the paint vapors get dense enough to explode you would not be breathing.   I usually spray outside the shop now.  Before I would set up a box fan pulling the air out of the basement.   The stuff I was painting was between me and the fan.  Get the air circulating before starting to paint. H^^
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Offline Crist Rigotti

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Re: Exhaust Fan Type?
« Reply #6 on: August 30, 2011, 02:43:59 PM »
I use a fan that has a shaded pole motor on it.
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Offline Steve Helmick

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Re: Exhaust Fan Type?
« Reply #7 on: August 30, 2011, 07:04:44 PM »
Wouldn't it be safer to have the fan pulling fresh air into the shop, so no fume/spark (or fan cleaning) issues?  ??? Steve
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Offline wwwarbird

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Re: Exhaust Fan Type?
« Reply #8 on: August 31, 2011, 09:44:23 PM »
 A few years ago, after much searching, I bought an exhaust fan already mounted in a sturdy frame with louvers that open and close automatically with the fans operation. I found it at a Mills Fleet Farm store and it's intended for farm building use. I simply made a 3/4" plywood adapter panel to mount it on so that fits right into the removed window of my basement shop. It's considered a 15" if I remember correctly, and they had bigger sizes too.
 While shopping for one I really focused on the cubic feet per minute of air the fans are supposed to move. I had it all figured out at the time, but theoretically it moves enough air that it exchanges the air in my shop at a rate of something like every three minutes. It's fairly quiet too considering all the air it's moving. With it running I can paint away like mad and you can't tell it anywhere in the rest of the house, in fact you barely even notice it in the shop.

 I have absolutely no idea whether or not it's "explosion proof", but is anything really? ;D
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