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| Safety -- Make sure you are safe! |
2009-12-03, 10:51am
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Pyromaniac
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Join Date: Aug 12, 2006
Location: Memphis, TN
Posts: 1,868
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Squirrel Cage Fan Question
I finally have chosen a blower for my 6 torch worktable with vent hood!
It's this one from grainger:
My question is about the fan itself. Do I need to build an enclosure for this fan? It is open on three sides, so am I losing cfms by not enclosing it?
One round side will obviously be connected to the vent hood and the other square side will be connected to the ductwork leading out of the studio. That leaves one round side open where the belt is. Do you see my point?
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Lana
Sexy Barracuda and Mirage
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2009-12-03, 11:27am
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Curmudgeon Engineering
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Join Date: Feb 15, 2006
Location: Near Seattle, WA
Posts: 1,723
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I use just such a fan. Mine is 3 speed and will literally move enough air to blow out the Mirage flame on high!!
Problem.. the fan sucks air from both round openings. My solution was to build a box of plywood, you might want to use metal, that encloses the whole fan and is big enough so that both round openings are clear. The square opening is vented outside through a louvered hole in my studio wall. I use the bottom of the box as the inlet or suction point to my hood since my fan is in the 'attic' directly above the hood, but you could cut a hole anywhere in the box to connect to your ductwork/hood. Keep in mind that you need a distance or clearance from the fan suction openings of at least 1/4 of the suction hole diameter for free flow.
PJH
Get that Mirage raging... you'll never look back  )
Or get one of my 4 stud manifolds for that Bacaruda!!
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2009-12-03, 5:04pm
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
Posts: 5,200
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Yes, this style fan needs to be enclosed in a plenum (box)...
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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2009-12-11, 7:11am
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Senior Member
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Join Date: Aug 01, 2005
Posts: 2,159
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Here's how I set up my similar blower. The box act as as a vacuum plenum. It's plywood with a sheet metal lining.
Works like a champ.
Robert
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2009-12-11, 7:42am
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Pyromaniac
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Join Date: Aug 12, 2006
Location: Memphis, TN
Posts: 1,868
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Thank you so much for the picture! This really helps me.
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Lana
Sexy Barracuda and Mirage
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2009-12-11, 12:53pm
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szglassy
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Join Date: Dec 20, 2007
Location: Palm Coast,Florida
Posts: 253
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What a neat little workspace Robert!
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2009-12-11, 2:12pm
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Disconnected
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Join Date: Jan 31, 2007
Location: Normandy, France
Posts: 1,323
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I see flexible ducting for fresh air intake, I was wondering if it was good enough as I'm planning to do the same thing.
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2009-12-28, 6:36am
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Senior Member
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Join Date: Aug 01, 2005
Posts: 2,159
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I've actually reduced the length of flex duct on the intake side, but it does OK. The intake is powered with the original Glasscraft fan and I still draw a little bit of room air, but not so much as to be a problem in hot/cold weather. The make up air intake is a 10" duct through the table in front of the torch.
Robert
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