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(1) F E = C 0 C 1 C 0 × 100 % Where FE represents the filtration efficiency of the dust mask. C 1 represents the dust concentration entering the mask only through the filtration element (mg/m 3). C 0 represents the ambient dust concentration (mg/m 3). The definition of the inward leakage of the dust mask is shown in Eq. .

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Safety

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High efficiency particulate air (HEPA) filter means a filter that is at least 99.97% efficient in removing monodisperse particles of 0.3 micrometers in diameter. The equivalent NIOSH 42 CFR 84 particulate filters are the N100, R100, and P100 filters.

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However, the remaining three dust masks, those with penetration > 15%, had quality factors ranging between 0.04–0.15 primarily because their initial BR remained relatively high. These results ...

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Similarly, three dust mask models had high penetration levels (81–89%) for polydisperse aerosol particles (Rengasamy et al., 2008). Thus, the penetration results obtained in the study indicate that the filtration performance of fabric materials is similar in some aspects to some surgical masks to reduce the transmission of infectious diseases.

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Assigned Protection Factors (APFs) Employers must use the assigned protection factors listed in Table I to select a respirator that meets or exceeds the required level of employee protection. When using a combination respirator (e.g., airline respirators with an air-purifying filter), employers must ensure that the assigned protection factor is ...

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Respiratory_Protection_Program - DOA Home

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Exception: Employers are not required to include in a written respiratory protection program those employees whose only use of respirators involves the voluntary use of filtering face pieces (dust masks), however requirements of 1910.134 Appendix D still apply.

Biological Safety Program Manual

BIOLOGICAL SAFETY PROGRAM MANUAL Page 34 of 96 the event. 5.19.1.4.5 Unless there is reason for more frequent certification, a one-year certificate life is appropriate. The certificate will generally expire on the last day of the month in which the certification was performed. 5.19.1.4.6 Recertification must be completed before the

[DOC]

Introduction - DSPS Home

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All new members shall undergo an orientation program as set forth by the Training Division. The main intent of the probationary period for a new recruit is to learn the operational procedures of the Fire Department, as well as the location/operation of the small equipment used by the Fire Department, and to gain Entry Level Firefighter training provided by within the recruit’s probationary ...

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Notes: 1 Employers may select respirators assigned for use in higher workplace concentrations of a hazardous substance for use at lower concentrations of that substance, or when required respirator use is independent of concentration. 2 The assigned protection factors in Table 1 are only effective when the employer implements a continuing, effective respirator program as required by this ...

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Filter incoming air using central or point-of-use high efficiency particulate (HEPA) filters capable of removing 99.97% of particles ≥0.3 µm in diameter: IB: VI.C.1.b. Direct room airflow with the air supply on one side of the room that moves air across the patient bed and out through an exhaust on the opposite side of the room: IB: VI.C.1.c.

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Respiratory Protection | Request PDF

Respiratory protection efficiency of facemasks is critically important in the battle against communicable respiratory infections such as influenza and severe acute respiratory syndrome (SARS).

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