nit: P100 is only for particulates. As DIYer I'd add an activated carbon organic vapor filter. If I were doing a lot of welding I'd research exactly what type o

nit: P100 is only for particulates. As DIYer I'd add an activated carbon organic vapor filter. If I were doing a lot of welding I'd research exactly what type of cartridges are appropriate for the particular materials. From the DIYer perspective you can get a good and comfortable silicone half face respirator setup for like $50. There's really no reason not to have one. I tend to favor 3M 7503 (or 7502/7501 for size), plus 60921 or 2297 (OV or not).