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Right? I started out as a painter on nightshift in a tooling shop. 10-14 hours a night wearing that respirator, with 2 10 minute breaks and 1 45 minute lunch.
Somehow I could still breathe, even when I was 20 feet in the air hanging near upside down to paint the underside of a fixture.
I don’t envy you the heat though. At least my shop was air conditioned. Respirators and heat really suck together.