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2. Training masks - Wikipedia

   en.wikipedia.org/wiki/Training_masks

   Training masks are facial masks worn to limit the intake of air during breathing. Their ostensible purpose is to strengthen the respiratory musculature by making it work harder. There is some evidence that they may improve endurance capacity ( VO 2 max ) and power output, but research into their benefits has so far generally proven inconclusive.

3. Joint Service General Purpose Mask M-50/M-51 - Wikipedia

   en.wikipedia.org/wiki/Joint_Service_General...

   The M50 series protective mask, officially known as the Joint Service General Purpose Mask (JSGPM or JSGPM/M50), is a lightweight, protective mask system consisting of the mask, a mask carrier, and additional accessories.

4. Bag valve mask - Wikipedia

   en.wikipedia.org/wiki/Bag_valve_mask

   Bag valve masks come in different sizes to fit infants, children, and adults. The face mask size may be independent of the bag size; for example, a single pediatric-sized bag might be used with different masks for multiple face sizes, or a pediatric mask might be used with an adult bag for patients with small faces.

5. Self-contained breathing apparatus - Wikipedia

   en.wikipedia.org/wiki/Self-contained_breathing...

   An open-circuit rescue or firefighting SCBA has a full-face mask, also called the face-piece, a demand regulator, air cylinder, pressure gauge, (sometimes with an integrated PASS device), and a harness with adjustable shoulder straps and waist belt which lets it be worn on the back. The air cylinder is commonly 4 liter, 6 liter, or 6.8 liter ...

6. MOPP (protective gear) - Wikipedia

   en.wikipedia.org/wiki/MOPP_(protective_gear)

   U.S. Marines in MOPP 4 gear during the 2003 invasion of Iraq U.S. Army soldiers test MOPP 4 gear at the Yuma Proving Ground's Tropic Regions Test Center in Hawaii. MOPP (an acronym for "Mission Oriented Protective Posture"; pronounced "mop") is protective gear used by U.S. military personnel in a toxic environment, e.g., during a chemical, biological, radiological, or nuclear strike:

7. Escape breathing apparatus - Wikipedia

   en.wikipedia.org/wiki/Escape_breathing_apparatus

   Polish Au-2 escape respirator. Escape breathing apparatus, also called escape respirators, escape sets, self-rescuer masks, emergency life saving apparatus (ELSA), emergency escape breathing devices (EEBD), and Respiratory Protective Smoke Escape Devices (RPED), [1] [2] are portable breathing apparatus that provide the wearer with respiratory protection for a limited period, intended for ...