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The FM12 has an overall lower profile than the S10 and sits closer to the wearer's face. The FM12's drinking tube is also longer than that of the S10, making drinking easier while wearing the mask. The FM12 also has an inner mask to prevent fogging of the lenses. The 'ridge' present around the edge of the S10 is absent from the FM12.
The C4 CBRN Protective Mask is the current issued gas mask of the Canadian Armed Forces. The C4 is a negative-pressure, full-face respirator with an ergonomic butyl rubber face piece. With its stretch-fabric mesh head harness and two simple adjustment pull straps, the C4 respirator is easily donned and doffed.
An open circuit SCBA typically has three main components: a high-pressure gas storage cylinder, (e.g., 2,216 to 5,500 psi (15,280 to 37,920 kPa), about 150 to 374 atmospheres), a pressure regulator, and a respiratory interface, which may be a mouthpiece, half mask or full-face mask, assembled and mounted on a framed carrying harness. [2]
A World War I British P Helmet, c. 1915 Zelinsky–Kummant protivogaz, designed in 1915, was one of the first modern-type full-head protection gas masks with a detachable filter and eyelet glasses, shown here worn by U.S. Army soldier (USAWC photo) Indian muleteers and mule wearing gas masks, France, February 21, 1940 A Polish SzM-41M KF gas mask, used from the 1950s through to the 1980s
The M50 series mask entered service in December 2006. [3] [4] In July 2014, Avon Protection received a contract to supply 135,000 M50s for $33 million. [5]In March 2016, it was announced that 166,623 M50s were purchased by the Department of Defense (DOD) under a $42 million contract.
Full-face elastomeric respirators generally seal better. [2] For substances hazardous to the eyes, a respirator equipped with a full facepiece, helmet, or hood is recommended. [35] Eyeglasses can clash with elastomeric masks. Conventionally, full-face masks are modified, with prescription lenses inserted into the mask.