... 3. Gas Mask wervice life, min: Depending on the selected canister 1. Applications and featureThe type ... , medium, large). The face blank size is marked on the figure: 1(small), 2(medium), 3(large). ... oversized. Then, press a palm tight on the hole to the canister and draw a breath. If the face ... 2 Wearing Wear the selected gas mask on abovementioned and connect a canister directly to the canister holder. ...