1, larggest protective factory 2,can produce all kinds of gas masks. 3, MF11B and MF14 gas mask have CE . ♥There are altogether two kinds of gas masks,one is made up of facepiece and small canister with direct connection;the other is made up of facepiece and large or medium canister with connection through hose.The latter can be fitted with blower,long hose and different kinds of large or medium ...