Review on MSA 815177 Combination Cartridge L Profile by Aaron Thawngzauk

Almost no air restriction. They also break down the bacteria that remain on your fabric or paper products. MSA calls it "Breathing Clean Air." It will protect you with the right protections. "P" stands for oil resistant. "N" does not represent 95 > 100 particulate matter stops. Guess: I think they aren't used to this day because they don't have activated carbon filtration.