UP is probably the "natural" way to do it...Consider this, your flame is pointed up and natural convection is up (hot air rises). Also overhead is easier to locate blowers and ancillary ducting....
Going down will tend to draw your flame down into your work if you work under the flame...Flame being bent unnaturally (downward) will tend to be erratic and probably move around... And you are probably going to have to use bigger blower and bigger duct to suck the contaminates downward... Also blower and duct work will be taking up "floor space" (along wall)... Probably the exact space you want to place your oxygen concentrator and glass storage...
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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