Copper 4 Non Logo Miss Dewalt Size:Large This mask is non-vented

This mask is  non-vented

Material efficiency BFE > 95   PFE > 94   VFE > 94

Built-in One way breathing air valve for smooth breathing and reduced heat build-up

decorators

meaning there NO are built in double breathing air valves and will be suitable for indoor mask requirements with certain health regulations in place

Copper 4 Non Logo Miss Dewalt Size:Large This mask is non-ventedNon Logo Copper 4 Dust Mask The 100% Copper infused Copper 4, Made in Canada protective mask has four layers of protection. Outer copper infused mesh layer for touch protection. two polypropylene built in layers and an inside cotton layer. Breath like you are wearing one layer but protection of four.