05-05-2020, 12:19 PM
For what it is worth....
I installed a common kitchen range hood over my bench to vent out fumes from my lead furnaces. I bought the heavy duty unit with similar sized dual squirrel cage fans in it - one on each side of the hood. The fans have an adjustable speed but they run at the same speed, they are not independently operated.
In use the hood sits roughly 24 inches over the top of the lead furnace(s). Even at full speed I found fumes from the furnace would spread out and find their way around the outside portion of the hood and build up at the "ceiling" instead of getting vented outside. The smallest amount of "cross wind" would deflect the fumes away from the underside of the hood and they got missed. I had to add cardboard panels to the sides of the hood to extend it downward so the fumes could not escape before being caught in the draft and expelled.
Once I tried using it while doing some MIG welding. Same thing. Unless you are DIRECTLY under the hood and in close proximity, the fumes will get away from those small squirrel cage fans. STICK welding is right out with the amount of smoke and fumes produced. Personally I would opt for your second choice and go with the larger 10" filter fans. Even better: At my old house I worked in a storage shed that I installed a 24" gable fan in and that worked a treat with the roll up door open at the other end. Can't do that in my current basement though.
I installed a common kitchen range hood over my bench to vent out fumes from my lead furnaces. I bought the heavy duty unit with similar sized dual squirrel cage fans in it - one on each side of the hood. The fans have an adjustable speed but they run at the same speed, they are not independently operated.
In use the hood sits roughly 24 inches over the top of the lead furnace(s). Even at full speed I found fumes from the furnace would spread out and find their way around the outside portion of the hood and build up at the "ceiling" instead of getting vented outside. The smallest amount of "cross wind" would deflect the fumes away from the underside of the hood and they got missed. I had to add cardboard panels to the sides of the hood to extend it downward so the fumes could not escape before being caught in the draft and expelled.
Once I tried using it while doing some MIG welding. Same thing. Unless you are DIRECTLY under the hood and in close proximity, the fumes will get away from those small squirrel cage fans. STICK welding is right out with the amount of smoke and fumes produced. Personally I would opt for your second choice and go with the larger 10" filter fans. Even better: At my old house I worked in a storage shed that I installed a 24" gable fan in and that worked a treat with the roll up door open at the other end. Can't do that in my current basement though.
Willie