Shaded Pole Blower Suggestions / Opinion?

Anonymous

Member since
November 2005

Shaded Pole Blower Suggestions / Opinion?

Posted by Anonymous on Monday, May 10, 2004 4:39 PM

Sorry to seem to be a little obsessive about this spray booth fan issue... but...

I have decided to go with a DIY version using a dedicated squirrel cage unit, and am now trying to determine if I should use a 265 CFM or a 428 CFM shaded pole blower. Both are from Dayton, here's a link to the larger one:

http://www.grainger.com/Grainger/productdetail.jsp?xi=xi&ItemId=1611769254

The smaller of the two is pictured on the left hand side of this page. I am curious / concerned though about the actual fan portion of this larger blower. In the photo, it seems like the fan unit may extend into the main blade area... either that or it is a very flat fan motor. From whatI've read the whole idea is to have the motor away from the blades.

Also, as far as the CFM amount. Without knowing what this sort of pressure actually feels like in person, it's difficult to make an informed decision.

I suppose if I bought the larger one, and it was too much draw, I could build some type of baffle to reduce the air flow.

I'll be making the spray booth housing (approximate size) 30" wide by 16 "deep... not sure about the exact dimensions yet.

Given that the larger unit is only about $20 more, seems like the way to go.

If there's anything I'm missing here. I'd appreciate hearing it before I buy the fan / build the booth.

Thanks again,
John

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MusicCity

Member since
January 2004
From: USA

Posted by MusicCity on Monday, May 10, 2004 7:16 PM

You didn't give a height for your booth, but assuming it's 16" high (same as the depth) that's 4.44 cubic feet. Even the small blower would evacuate the entire booth in about a second, the large one in about 0.6 second. I don't have a good feel for what that amount of flow would feel like either, but I suspect that either would do the job.

I suspect something that large is going to be pretty noisy. You may need to build an insulated enclosure around it if it becomes too noisy.

Scott Craig -- Nashville, TN -- My Website -- My Models Page

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Anonymous

Member since
November 2005

Posted by Anonymous on Monday, May 10, 2004 7:28 PM

John, one avenue that might help is to read the article written on

http://modelpaint.tripod.com/booth2.htm.
Note: You may have to type the URL in your browser direct. Seems Tripod does not like to link directly Dead [xx(]

I used Mr Raddatz ideas and specs to build a paint booth for my shed. I use a 425 cfm blower, but I am pushing air through a 1micron filter and a activated carbon filter. Browse through the article and see if that will help you.
Good Luck

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Anonymous

Member since
November 2005

Posted by Anonymous on Monday, May 10, 2004 7:51 PM

The shaded pole I use (pictured in your earlier post) is 350 CFM from Dayton, the plenum opening in the bench is 10" x 20"x 2" and without anything over it to create the booth, you can use be working right over a model and not even get a whiff of glue or paint. When spraying with the 'booth' intact, I can aim my AB horizontally and parallel to the fan and the mist will 'bend' towards the opening. You can also feel the air movement past you and if outside the opening, no odor whatsoever.
The 350 set up like I have it will move light things on the bench towards the screen so watch your PE.
Keep in mind, the Dayton motors are heavy, so top or side mounting on sheet metal would need a lot of reinforcement. I mounted mine to birch ply with rubber bushings and bolts, then covered with sheet metal so it was easy to clean.

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Anonymous

Member since
November 2005

Posted by Anonymous on Monday, May 10, 2004 10:58 PM

AUSF...

I just had another look at your setup in the other thread, as well as re-reading this last post of yours. I was thinking about a bottom mount for mine as well. Hard to tell from the photo, but does the flange on the blower bolt directly into the underside of the table on your rig? I ask this because the fan looks like it's on it's side... which would then need a small, right angle bit of duct work to attach to that table underside.

I also had thought to create some type of baffle (plemium) to distribute the draw of the air.

Matt... Could you offer an objective opinion as to the noise level in your 425 CFM blower?

Thanks...
John

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Anonymous

Member since
November 2005

Posted by Anonymous on Tuesday, May 11, 2004 9:01 AM

The fan is horizontal, bolted to the plenum. You'll have to drill the motor housing and run bolts through the bottom of the plenum with rubber bushings to deaden vibrations. the chamber is 2" deep and 10" x 20" box. I used sheet metal duct running out the wall and you'll have to fabricate an adapter from the flange to the duct. I used aluminum tape to seal everything as well as inside the plenum. I'll try to take some pics from the underside when I can. Like I said, It was abit of work, but well worth it for me.
In terms of loudness, it's more a matter of rushing air than fan motor noise. It doesn't bother anyone outside of the booth area, but you certainly know it's on when using it.

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Anonymous

Member since
November 2005

Posted by Anonymous on Tuesday, May 11, 2004 11:55 AM

Thanks ausf...

I'm still deciding on how large to build my booth, so this adds to the current indecision regarding fan selection. I may be doing some larger pieces, so at the moment... this could change of course :), I'm leaning towards the bigger Dayton fan:

http://www.grainger.com/Grainger/productdetail.jsp?xi=xi&ItemId=1611769254

It's a bit larger than the 350 CFM, and about $20 cheaper. One thing that I'm not clear on though is the motor itself. This is called a shaded pole motor, but as I wondered in the intial post... is this motor very flat, or does the body of the motor extend into the fan itself?

Have to find out about this...

John

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Anonymous

Member since
November 2005

Posted by Anonymous on Tuesday, May 11, 2004 1:26 PM

Here are some pics of the Dayton under the bench. The yardstick is for scale:

And here's the screen from the top:

As you can see, it's not small. The motor is completely out of the airstream of the blower. Works great!

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Anonymous

Member since
November 2005

Posted by Anonymous on Tuesday, May 11, 2004 2:41 PM

This is great stuff. I have been thinking about building a spray booth my self, but haven't been able to find a suitable extraction system. This is exactly what im looking for, do any of you know if they have any extraction units for 230V.
I like your set up ausf, what kind of filter do you use ??

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Anonymous

Member since
November 2005

Posted by Anonymous on Tuesday, May 11, 2004 3:47 PM

This fan motor is 110 but you should be able to find 230, especially over there.
There's no filter, just a screen and louver to keep stuff from the blower cage. I'm venting right out of the wall so I saw no need for a filter. I only use acrylics and non-toxics as well so I'm not concerned about complaining neighbors. It's also near the peak of the roof so most fumes are wisked away by the wind.
The bench mount works very well because it's versatile for other needs.

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