Look at O2 mask or newer canula types always just enrich the air and not pure usually. I've seen O2 and a cigar burn through a 1/4" steel plate as easily as a cutting torch. I used to tend heating about 10 acres of greenhouses n winter and I breathed )2 for 15 minutes after each walk around.So 45min walking following sitdown with O2, Possibly CO in -houses from heaters and woodstoves,coldest nights we even set up brazures with 10-15 bags of charcoal burning when so the O2 let me have the breath capacity to run in check fires and get out without breatheing in the charcoal lit houses. The O2 was regulated,humidified and fed into a mask with air holes. Medical tanks are cetified not to have any oil lubricants and threads and valve clear of oils as in you can't breathe oil fires.A soap is used like in SCUBA tanks.

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