And I have one like this that is put in front of the side yard door to constantly blow cool air in. I run this 90% of the time I am in the shop, and the other 2 only when I am welding long periods and want to exhaust quickly (or grinding) or am plasma cutting. This works good for blowing through the shop, or if I don't open the garage it sucks in the cooler air and the hot escapes through the roof vents.
When I own my own place I want to put a couple of these up high to really move the built up heat. 2 of these in a 2 or 3 car garage may be enough by themselves to bring in fresh air through a garage door, or side door.
Then what Todd W recommends is the ticket! I know I gettin one for my garage when we get a house.... the wife is a total disbeleiver that one these suckers can cool off a house just by air movement. Just wait til I have that sucker keepin me cool while wrenching.
I have this one built into the wall... It's a 36 inch and runs off of normal 120v. Pulls quite a bit of air (7100 cfm I think), and works great to exhaust those welding fumes. I have a squirrel cage blower mounted near the rafters but I think the motor is burned out because last time I plugged it in I got nothing.
I also have a whole houe fan in my attic that isn't use anymore. I may move it out to the garage for venting the hot air out the top.
I have a squirrel cage fan that is mounted onto a old push mower deck with the wheels...makes it easy to move around. If you do this make sure you mount the fan sideways, i didnt and it will blow its self across the shop.
I use a 3 speed air mover. The fans that flood restoration companies use to dry out wet carpeting and flooring. Moves a lot of air and not loud. I usually run it at the slowest speed to keep it from blowing too much dust around. It's also nice because you can have nice air movement when your laying under your junk.
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