Correct way to filter fumes from spot welding?

[xalky]

Thanks Ray,
will a cheap HF DUST Collector with a 4" hose work to keep fumes from traveling up to main house, basement shop.
Thanks,
Jon

The simple answer is yes, but with some caveats. You want to create a negative pressure in your basement. That HF dust collection fan will work well but you should pull clean air from the upstairs or just create a vacuum in your basement. Make a tight sealing exit for the exhaust port. Let the fan pull air from every crack and crevice in your basement. The minute you open a window or a door other than the living space door you remove the vacuum in the room.

Theres another issue with doing this in the basement, it is possible(I've done it) that you can actually pull furnace fumes into the basement area through the chimney and out the burner area. This is not good if your furnace is in the basement. The best way to insure that your fumes stay confined is to build an enclosed area with a fresh air intake and an exhaust. Make sure that your exhaust is far enough away from your intake so as not to be pulling in dirty air from your outside exhaust. You can do it on the cheap with 6 mill plastic.

With the fan running and exhaust pipe well sealed, You can regulate air intake by opening a door starting with the living space door. Sounds counter intuitive. The airflow will take the path of least resistance which is from your living space. The fumes can not go upwind. This is how it's done when building confinemnt areas for mold, asbestos, lead paint etc. In those cases the exhaust air is filtered, usually with a hepa, but in your case, your just exhausting nuisance fumes.

Marcel