Half masks

Filtering devices Half or quarter mask and filter Filtering half-mask without inhalation valves Valved filtering half masks Filtering half masks Full face mask and filter Power assisted filtering device with full, half or quarter masks Power filtering device with helmet or hood 4-40... 

Withdrawn) 1990 AMD 1 Half masks and quarter masks for respiratory protective devices (AMD 7113) dated 15 November 1992. Withdrawn, superseded by BS EN 140 1999 Guide to the use of electrical apparatus complying with BS 5501 or BS 6491 m the presence of combustible dusts... 

AMD 2 Respiratory protective devices - Compressed air line breathing apparatus for use with a full face mask, half mask or a mouthpiece assembly - Requirements, testing, marking (AMD 10774J dated Januai-y 2000. With BS EN 138, BS EN 269 and BS EN 270, superseded BS 4667-3 1974... 

Filtering half masks to protect against particles. Superseded BS 6016 1980... 

Figure 9-12 shows a typieal half-mask respirator without eartridges attaehed. One of many types of eartridges that eould be used with this... 

FIGURE 9-12. A half-mask respirator. Photo Courtesy 3M... 

Eor example, at Site G, no rationale was provided for using modified Level C PPE for a few jobs for whieh use of a half-mask respirator is permitted. Additionally, the Site E site plan did not eontain any site-speeifie PPE information that employees eould use for site tasks and operations. 

Half-face respirator See Half-mask respirator. 

Half-mask respirator A respiratory protective device that covers roughly half of the face, from under the chin to the bridge of the nose. 

Figure 2. Respiratory protective equipment. Full-mask facepiece, half-mask facepiece, air-supplied head hood.

Figure 6.14 Air-purfying respirator-half mask. Worker is also wearing goggles with indirect air vents and a large brimmed hat for protection (courtesy of University of Wisconsin-Extension). 

Optional coveralls, chemical-resistant disposable outer boot-covers, hard hat, face shield Full-face or half mask, air purifying respirators (NIOSH approved)... 

Alternatively, the coupling of half masked alkyne 87 and dienyliodide 88 gave key... 

Air-purifying half-mask or mouthpiece respirator with chemical cartridge... 

Employees engaged in handling operations involving the carcinogens listed below must be provided with, and required to wear and use, a half-mask filter-type respirator for dusts, mists, and fiimes. A respirator affording higher levels of protection than this respirator may be ... 

Half-mask respirators shall not be used for protection against arsenic trichloride, as it is rapidly absorbed through the skin. A high-efficiency filter means a filter that is at least 99.97% efficient against mono-disperesed particles of 0.3 pm (micrometers) in diameter or higher. ... 

Half-mask, air-purifying respirator equipped with a high-efficiency filter. ... 

Supplied-air respirator with half-mask or full facepiece operated in pressure-demand or other positive-pressure mode. 

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