Half-mask respirator

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. 

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. ... 

X PEL Quarter- or half-mask respirator, odier dian a disposable respirator, equipped widi particulate filters. 

A half-mask respirator with cartridges specifically approved for protection against formaldehyde can be substituted for the full-facepiece respirator providing that effective gas-proof goggles are provided and used in combination with the half-mask respirator. ... 

X PEL Half-mask respirator with high-efficiency cartridge. ... 

CcrOv 10 Any air-purifying half-mask respirator equipped with organic vapor cartridge(s). 

CcrOv95 10 Any air-purifying half-mask respirator with organic vapor cartridge(s) in combination with an N95, R95, or P95 filter. The following filters may also be used N99, R99, P99, NlOO, RlOO, PIOO. See Table 4 (page xxv) for information on selection of N, R, or P filters. 

Because most healthcare workers wear the very light disposable half-mask respirator, recommend that a health questionnaire be the initial step in the evaluation process. Refer to OSHA 29 CFR 1910.134 paragraph e for guidance on medical evaluation. Appendix B of the Standard contains a sample medical questionnaire. If results from this evaluation are essentially normal, the employee can be cleared for respirator wear. Further evaluation, possibly including a directed physical examination and/or spirometry, should be considered in cases in which potential problems are suggested on the basis of the questionnaire results. 

Provide employees with a full facepiece respirator instead of a half mask respirator for protection against lead aerosols that may cause eye or skin irritation at the use concentrations. Provide HEPA filters for powered and non-powered air-purifying respirators. Provide a powered air-purifying respirator when an employee chooses to use such a respirator and it will provide adequate protection to the employee. 

B) Provide employees with a full facepiece respirator instead of a half mask respirator for protection against lead aerosols that may cause eye or skin irritation at the use concentrations. 

The probed respirator is only used for quantitative fit tests. A probed respirator has a special sampling device, installed on the respirator, that allows the probe to sample the air from inside the mask. A probed respirator is required for each make, style, model, and size that the employer uses and can be obtained from the respirator manufacturer or distributor. The CNC instrument manufacturer. TSI Inc., also provides probe attachments (TSI sampling adapters) that permit fit testing in an employee s own respirator. A minimum fit factor pass level of at least 100 is necessary for a half-mask respirator and a minimum fit factor pass level of at least 500 is required for a full facepiece negative pressure respirator. The entire screening and testing procedure shall be explained to the test subject prior to the conduct of the screening test. 

B) Ensure that employees do not use half mask respirators for protection against arsenic trichloride because it is absorbed rapidly through the skin. 

For greater concentrations, quantitative fit-testing (QNFT) must be used. When quantitative fit-testing is used, all full-facepiece respirators must meet or exceed a fit factor of 500, while quarter-and half- mask respirators must meet or exceed 100. 

Worker exposure should be low under normal operating conditions. Monitoring during production and handling indicated that airborne concentrations were below the acceptable exposure limit of 2 mg/m. If exposure limits were exceeded, workers were to don half-mask respirators with PlOO filters according to the safety precautions specified for DuPont Light Stabilizer 210. 

Half Mask Respirator. A rubber or plastic facepiece that covers the nose and mouth and has replaceable filter cartridges. 

Single-use respirator Quarter-mask respirator Half-mask respirator Full-face respirator... 

Routine Use 1. Consider skin irritation and sorption of the material through the skin. 2- Poor warning properties - eliminate all air-purifying respirators. 3. Eye irritation - eliminate or restrict use of half-mask respirators. 4. IHLH or LFL - above this concentration eliminate all but positive-pressure self-contained breathing apparatus and combination positive-pressure supplied-air respirator with auxiliary positive-pressure self-contained breathing apparatus. 5. List all allowed respirators by condition of use and type. 

Half-mask respirator - which has a rubber or plastic facepiece covering the nose and mouth, and which carries one or more replaceable filter cartridges... 

Disposable filtering half-mask respirator 4.5 to 50 Positive pressure powered respirator 20 to 2000... 

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