1.MF11B activated carbon filter gas mask(Silica Gel gas mask) 2.ISO9001,CEcertificate,GB2890-1995 3.supply sample MF11B type gas mask1. Product Information The type MF11B gas mask is a novel design gas mask, whose canister is connected directly to the face piece. When the air is a contaminated NBC agent, the gas mask provides effective protection to the wearers respiratory organs, eyes and facial ...