2. Respirator Terminology
Using the OSHA Definitions Handout

3. Name that TERM! Using OSHA Definitions Handout
A filter that is at least 99.97% efficient in removing monodisperse particles of 0.3micrometers in diameter.
A respirator in which the pressure inside the respiratory inlet covering exceeds the ambient air pressure outside the respirator.
High efficiency particulate air (HEPA ) or
N, R, P100
Positive Pressure Respirator

4. Name that TERM! Using OSHA Definitions Handout
An atmosphere that poses an immediate threat to life, would cause irreversible adverse health effects, or would impair an individual’s ability to escape from a dangerous atmosphere.
An atmosphere-supplying respirator for which the source of breathing air is not designed to be carried by the user.
An air-purifying respirator that uses a blower to force the ambient air through air-purifying elements to the inlet covering.
Supplied-Air Respirator
(SAR) or Airline
Immediately Dangerous to Life or Health (IDLH)
Powered Air-Purifying Respirator (PAPR)

5. Name that TERM! Using OSHA Definitions Handout
A quantitative estimate of the fit of a particular respirator to a specific individual, and typically estimates the ratio of the concentration of a substance in ambient air to its concentration inside the respirator when worn.
A system that warns the respirator user of the approach of the end of adequate respiratory protection, for example, that the sorbent is approaching saturation or is no longer effective.
End-of-Service-Life Indicator
(ESLI)
Fit Factor

6. Name that TERM! Using OSHA Definitions Handout
An action conducted by the respirator user to determine if the respirator is properly seated to the face.
An atmosphere with an oxygen content below 19.5% by volume.
Any occurrence such as, but not limited to, equipment failure, rupture of containers, or failure of control equipment that may or does result in an uncontrolled significant release of an airborne contaminant
User seal check
Emergency situation
Oxygen deficient atmosphere

7. Name that TERM! Using OSHA Definitions Handout
A respirator with an air-purifying filter, cartridge, or canister that removes specific air contaminants by passing ambient air through the air-purifying element.
A respirator intended to be used only for emergency exit.
Escape-only respirator
Air-Purifying Respirator or
APR
WHAT IS A HAZARD RATIO???

8. Hazard Ratios
Maximum Use Concentration (MUC): means the maximum atmospheric concentration of a hazardous substance from which an employee can be expected to be protected when wearing a respirator, and is determined by the assigned protection factor of the respirator or class of respirators and the exposure limit of the hazardous substance. The MUC usually can be determined mathematically by multiplying the assigned protection factor specified for a respirator by the NIOSH recommended exposure limit (REL), permissible exposure limit, short term exposure limit, ceiling limit, peak limit, or any other exposure limit used for the hazardous substance.

11. Respiratory Choice Example 1:
Contaminant X, a particulate, has been monitored in the workplace at 78mg/m3 during a 8 hour shift. It is an atmosphere containing oil, it is also an irritant for the eyes and skin. The workplace is located in a plant where there is no risk of oxygen deficiency.
The PEL for contaminant X is at 10mg/m3 and IDLH is at 180mg/m3
Based on this information, here are the results for the Hazard Ratio calculation:
Concentration 78mg/m3 divided by PEL 10mg/m3 = 7.8
Now let use the NIOSH/OSHA Selection Logic and see the result:

12. Respiratory Choice Example 2: 10 mg/m3 divided by 0.05 mg/m3 = 200
Contaminant Y, a fiber, measured at 10mg/m3 during an 8 hour shift. This product is classified as CARCINOGEN (Appendix A NIOSH) and the PEL is at 0.05mg/m3. The IDLH is 50 mg/m3 and it is an irritant for the eyes and skin. No risk of oxygen deficiency.
Hazard Ratio will be :
10 mg/m3 divided by 0.05 mg/m3 = 200
What is going to be the respiratory selection?

13. Respiratory Choice Example 3: 70 ppm divided by 35 ppm = 2
Contaminant Z (Organic Vapour) monitored at 70 ppm for an 8 hour shift. With the help of certain data, (the EZ-Guide) the usage time of the cartridges have been evaluated at 8 hours in the workplace.
PEL is at 35 ppm and the IDLH is at 250 ppm.
The Hazard Ratio is :
70 ppm divided by 35 ppm = 2
The result with the Flowchart is:

14. Respiratory Choice Example 4: 60 ppm divided by 25 ppm = 2.4
Contaminant is Ammonia monitored at 60 ppm for an 8 hour shift, it is an irritant for eyes and skin.
The PEL is 25 ppm and IDLH is at 300 ppm and the customer doesn’t have a clue on how long the cartridges are lasting.
Hazard Ratio base on our calculation is:
60 ppm divided by 25 ppm = 2.4
The selection will be:

16. Do I Need A Full Face Respirator?

17. Do I Need A Full Face Respirator?