This document contains guidance to frequently asked questions about PPE, links to credible
resources and other options you may consider in the absence or limited availability of PPE.
Q. The use of N95 masks has been deemed necessary in your work
environment. Disposable N95 Respirators are unavailable, what do you do?
A. The classification of respirators comes from the National Institute for Occupational
Safety and Health (NIOSH) where the N (not oil proof) rating is applied. If N95
respirators are not available, consider the use of R (oil resistant) or P (oil proof) rated
respirators. These are all respirators that also filter out particulate at 3 microns. Each
of these N, P and R particulate filters can have three levels of filtration efficiency.
The number in the name refers to the level of efficiency in filtering particulates at
3 microns in diameter and categorized as 95, 99 and 100. Disposable masks are not
designed to be washed or wetted. Speak to your supplier as to what is currently
available. You can also investigate these options.
1. Half-face respirators and power air purifying respirators are another option and offer greater
protection than disposable N95 respirators. Both types of respirators require the use of one or
two HEPA filter cartridges that can be replaced, depending on the style. These respirators can
be cleaned and reused. Follow the manufacturer's instructions.
2. Workers that are required to use an alternate style of respirator should be informed of any
changes and included in the selection process in order to minimize the potential for user
acceptance issues.
3. Irrespective of the type of respirator, the wearer must be trained and properly fit tested to
the equipment, its use and limitations. Refer to the Canadian Standards Association Z94.4-18
– Selection, use and care of respirators, for further guidance. Correct user seal checks and
doffing methods to prevent cross contamination must be adhered to. In all cases, ensure that
manufacturer directions for use, cleaning and maintenance are followed. www.csagroup.org
4. When fit testing respirators, the fit testing hood and associated equipment must be sanitized
between users. https://multimedia.3m.com/mws/media/1819154O/fit-test-hygiene-during-
covid-19-pandemic.pdf
FAQ: PPE Considerations
Hierarchy of Controls for Biological, Chemical and Physical Agents
WSPS.CA
