Paint booth fan

[neblinc]

Tried to search on the site here to find more info on a exhaust fan for a paint booth. Will this fan work?
Motor Type = Shaded Pole is that what I am looking for?

I had found a fan last year that was explosion proof that was not to expensive on the web that looked like a "torpedo heater" but dang if I can find it again.

Randy

 

[gotmud13613]

Looks like it will work, I purchased mine from autobody toolmart years ago. Here is a link to there fans, The price is quite a bit more though.

http://www.autobodytoolmart.com/c-881-explosion-proof-fans.aspx

 

[swampymarsh]

I would be concerned about the amount of air flow that you would get once you get the filters in place. These will start to caviatate if you have any blockage. Compare a household box fan to a HVAC fan. A box fan won't pull much air through a filter where as a squirrel fan will continue to ****. Most type of paint booth fans mount the fan in a tube and the explosion proof motor outside of the tube. These allow a positive displacement with filters. Another big concern would be hanging a heat source (or spark) in the flow of all of the solvents floating in the air, HC combined with air is not a good combination. Any way you do it it needs to be grounded as static electricity is not your friend.

I guess that is why the paint booth use tube fans instead of building eshaust fans.

Look under Gotmuds link under paint booth. Click on Fans, you'll see the difference.

Good Luck!!

 

[neblinc]

I just can't find that one in a "tube" that I found last year, should have bought the dang thing then.

Randy

 

[Freejack]

As far as the motor type, shaded pole doesn't mean anything as far as application in a paint booth goes.

By the discussion, I take it, you are creating a negative pressure booth and are planning to have the motor downstream from the booth, in the exit airstream, I would assume that any motor used in that application should be explosion proof.

An alternate method is a positive pressure booth. My father did this in his shop, using a rather large box fan (not too different than the shutter fan you show, just bigger). The air exits through via a large grate in the floor through a 3' pipe that rises about 8' away from the shop.

Jake

 

[Bib Overalls]

Friend used a commercial ventilation fan in his paint room. Set it up to draw air out. He uses the paint room almost every day. In about 6 months the fan motor was covered with about an inch of paint mist build up. The motor overheated and failed. He replaced it with another ventelation fan. And in about 6 months it also failed. So he bit the bullet and bought a exhast fan that works like a marine outboard motor. The fan blades are in the air stream and the motor is several feet away and seperated by the ducting. Expensive. But no problems in a couple of years.

A squirle fan is an option. A local HVAC contractor may have a takeout that you can adapt. The motor is out of the airstream and they move a lot of air.

No matter what type of fan you use make provisions for a filter and perform regular, scheduled cleaning and preventive maintenance.

 

[Franz©]

It will work for a short while.
Paint has the nasty habit of adhering to the fan and motor, so most booth fans employ a narrow bladed steep pitch blade. Generally they will be on a jackshaft and belt driven to keep the motor out of the paintstream.
Even the narrowbladed propellors need frequent cleaning because the accumulated paint doesn't sloff off like grease does, and without cleaning efficiency suffers quickly on the coated blades.

 

[Steve in Mi]

Will this fan work?

I'd pass this one up based on it having sleeve bearings alone. I'm a ball bearing guy.

 

[66RICH]

Here's a link to another source.

http://www.bowlinent.com/vent/fans1.htm

Rich

 

[boo coo tracks]

I think -shaded pole motor- allows you to vary the speed of fan. CFM
HTH

 

[Freejack]

Yes and no on the variable speed, of all the induction motor types shaded poles are the least effected by variable voltage devices, but still have limitations. There are also other devices that can vary the speed, such as wave choppers and at the higher end variable frequency drives.

The one advantage in a fan application is that you do not need to reduce the RPMs very much to see a significant reduction in airflow, so if you did want vary the speed, you probably could get away with the doing so.

Jake