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Unread 07-19-2013, 01:02 AM   #1
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Shop exhaust fan

I have a 1500 sqft fabrication shop comprised of 3 rooms for sheet metal, welding and general fabrication. I want to set up an exhaust fan in it to remove excessive heat and welding fumes. My shop has a 16ft wide garage door at one end and 10 ft at the other. When they are both open I have good natural cross ventilation, however, the wind blows welding gas away so I always have to close one door.

I am considering installing wall mounted shutter exhaust fans in each room or I can get a large drum fan like this for a fraction of the price.

If I were to set this fan by an open garage door and point it blowing outside, would it act the same way as a wall mounted exhaust fan for removing welding fumes? My gut says it would not be as efficient.

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Unread 07-19-2013, 07:12 AM   #2
Web Wheeler
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A drum fan would work but they are loud. I would go for the exhaust fan personally as thats what they are built for. Northerntool has some good ones that mount directly in the wall.
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Unread 07-19-2013, 09:33 AM   #3
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Mount an exhaust fan as high as you can,this removes all the fumes and the heat too,but being high up it doesn't effect your welding gasses down low.

They don't have to be too big,just mount it on an exterior wall in the rooms needed and either buy or build some kind of door or flap that can be opened when running the fan and closed to protect from weather
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Unread 07-19-2013, 11:12 AM   #4
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Assuming you have 10' ceilings, you have about 15,000 cubic feet in your shop, that would be the entire shop. Different if sectioned off. A 12" vortex can fan used for extraction (above) will move about 1,140 cubic feet of air per minute. With one fan, you get total air replacement and fume extraction in 13 minutes. Or 6.5 minutes with two fans. These fans are pretty versatile in that they will attach to a wall with flanges that are made for them, you can also fab a hood like the fancy Dantherm extractors for pinpoint fume extraction. They are quieter than the drum fan you have posted also. The one pictured runs about $270.
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