1.Head harness and solid framework type; 2.Comfortable to wear; 3.Good flexibility, ... -ividual protective equipent,which consists of a head harne-ss type facepiece, a corrugated hose and a canister. The ... high strength and abrasion resistan-ce. A new-type air guide is pr-ovded inside the facepiece to ... MAINTRNANCE AND USR (1).The MF 12 is available in three sizes (large, medium, sm-all). The mask size ...