Ok...
A hood 31x60 has a ""face opening" of 1860 square inches....
The converts to 12.9 square feet. 1860/144=12.9166666
Current thinking is you need 125 cfm of air flow per square foot of hood opening (face opening)...
12.9 square feet times 125 equals 1614.5 cfm....
So desirable flow will be 1615 cubic feet a minute.
The best blower you can use will be the "curve blower" more commonly referred to as a "squirrel cage" blower...
Second choice will be a inline....
As for the propeller fan blowers, I would skip them....
Height of hood over work surface should be kept as low as practical.. Meaning just high enough that you don't bump your head on it when working at torch... Usually that is about 24 inches...
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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