Respirators are essential protective equipment designed to safeguard workers from inhaling harmful airborne particles, gases, vapors, or infectious agents. Respirators play a crucial role in ensuring the health and safety of workers exposed to hazardous substances. However, even the best respirator is only effective if it fits properly. This is where respirator fit testing comes in — a critical process to ensure that the respirator forms an effective seal on the wearer’s face and provides optimal protection.
What is Respirator Fit Testing?
Respirator fit testing is a process used to evaluate how well a respirator fits the wearer’s face. The purpose is to identify if the respirator forms a proper seal and whether air can leak in through gaps around the edges. A good fit ensures that the respirator effectively filters harmful particles and protects the wearer from exposure to respiratory hazards. Fit testing is not just a one-time procedure but should be repeated periodically to account for changes in factors like weight, facial hair, or physical condition.
Key Factors Affecting Respirator Fit
Several factors can influence the effectiveness of respirator fit:
- Face shape and size: Different respirators fit different face shapes. Some workers may require a specific model or size to ensure a good seal.
- Facial hair: Beards, mustaches, or even heavy stubble can interfere with the seal of a respirator. OHSA guidelines state that respirators cannot form a proper seal if there is facial hair in the sealing area.
- Clothing and accessories: Items like glasses, headbands, and clothing hoods can also interfere with the fit of the respirator.
When Should Fit Testing Be Done?
Fit testing should be conducted:
- Initial Fit Testing: When a worker is first assigned to use a respirator, they must undergo fit testing to ensure that the respirator forms a proper seal and is effective in protecting them.
- Annual Fit Testing: Fit testing should be repeated at least once per year, as per Ontario’s Occupational Health and Safety Act (OHSA) and the Regulation for Control of Exposure to Biological or Chemical Agents (Reg. 833).
- Changes in the Worker’s Physical Condition: If a worker’s facial characteristics change (e.g., due to weight gain or loss, dental work, facial scarring, or changes in facial hair), a new fit test may be required to ensure the respirator still fits properly.
- Change of Respirator: If the worker is required to use a different type or model of respirator, a new fit test must be conducted to ensure proper fit.
- Inadequate Fit: If there is any indication that a respirator does not fit properly (e.g., discomfort, leakage, or fit test failure), a new fit test is necessary.