I guess I should have mentioned that these blowers are designed for paint booths and have some sort of listing for that purpose. I can only imagine that either somebody got paid off big time to allow such a thing or that I completely misunderstand this type of hazardous location. Even though I would normally never imagine doing such a thing, my plan is to use no seal-offs or rigid pipe. It makes no sence what-so-ever with the half-azz box I am running to.