12-08-06 Have been using this for awhile. It takes air from the outside vent, blows it through my welding mask/helmet. When I am sitting down, welding mask bottom, is just about over the square outlet. Some air goes in front of the welding mask. Most of the air, vents my open welding helmet, very good. Head aches are now gone, when using the arc. This ventalitor is sold by hf and home depot. Its got a 3 position switch on the handle. I have also tried a 3 ft square overhead, vent.. but I still got headaches. I have also tried leaving the garage door open, a big fan, blowing across the welding table. Still got headaches. xman xmans handle is xmradio