I hadn't even thought of that! I did some oxyacetylene welding many moons ago and I remember the heat being absolutely intolerable at times.

I do machining as a hobby now and I'd really like to filter out cutting oil smoke. My biggest fear using a PAPR is my shop is the hose—I'd need to find a way to keep it REALLY close to my body. I don't want to get pulled into my lathe face-first.