If you duct air in from side it will probably move flame around....IT should actually be in front of you and torch near back of bench...
Best to use 8 in or 10 in steel (smooth wall) duct... To much flow loss (static pressure) in flex duct...
Your fresh air intake (makeup air) should be at least 10 feet away from your exhaust duct...
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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