Cody Bratton
TVWBB Wizard
I will say I don’t know that either. I generally got 2-3 years out of a mask before the straps failed, but that was daily use and I would change out the pre-filters by appearance. I’d guess every 4-6 months or so.I admit that I do not have any idea, but I am a little dubious that they are good for years if used semi-regularly.
The most important part obviously is the seal around your face, and wearing it tight even if it’s somewhat uncomfortable.
The link Jon posted is a reputable company (Gerson) in the auto body industry.