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The size of the mask

A properly matched helmet mask should fit snugly to face and to prevent the penetration of outside air into the respiratory system, bypassing gas box.

Check the selection of the helmet-mask and gas mask serviceability of getting it into use, and also during the operation carried out visual inspection and check mask for leaks.

External inspection of the mask to make in the following order:

- to verify the integrity of the helmet-mask, after inspecting it; places found punctures or impulses to circle the outside of the chemical pencil or pen;

- to check the integrity of the parts of the membrane boxes and the correctness of its Assembly;

- to verify the integrity of the glasses, serviceability of the fairings, the availability and operability of pressure rings;

- inspect the valve box and check, whether it dents, holes and rust; to check the status of valves, and rubber intermediate ring;

- inspect connecting hose and check, whether it punctures and tears, if the flare is not folded or winta nut, there are no cross-threading;

- inspect the gas box and check, whether her holes, rust and not dented whether the neck and cap;

- remove the rubber stopper from the hole in the bottom of the gas box;

- to check the presence and condition of insulation rubs, boxes with steam-resistant films and spare membranes, "pencil" against fogging glasses.

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