The Importance of a Properly Fitting Mask
For respiratory protective equipment (RPE) to work effectively, it must fit correctly. Tight-fitting masks, such as disposable respirators, half masks, full face masks, and tight-fitting powered air-purifying respirators (PAPRs) all require a good seal to the wearer’s face to provide protection. Without the right fit, harmful substances can leak in and put the wearer at risk. Loose-fitting PAPRs, however, do not rely on a face seal but must still be worn as specified by the manufacturer.
Fit Testing: What You Need to Know
Fit testing is a legal requirement for anyone using tight-fitting RPE. It ensures the selected model and size provide an adequate seal for each individual wearer. Fit testing must be carried out:
- When RPE is first selected
- Regularly as part of ongoing safety measures
- Whenever there are changes to the RPE or the wearer (e.g. weight changes, facial surgery, or switching to a different mask)
Fit Testing Applies to:
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Disposable respirators
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Half masks
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Full face masks
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PAPRs with tight-fitting facepieces (tested in “Power OFF” mode)
Fit testers must be competent and able to carry out the correct method, identify fit issues, and fully understand the relevant safety regulations.
Loose-fitting PAPR’s do not require Fit Testing and are suitable for people with facial hair.
Fitting Your Mask Correctly
To be effective, your mask must be worn correctly every time. Always follow the fitting instructions provided with your mask. Some general tips:
- Disposable Masks: Position straps correctly and adjust the nose clip for a firm seal. Tighten adjustable straps if required. Do not pinch the noise clip, but instead to use 2 fingers and press firmly along the clip so its forms a mould around the nose.
- Reusable Masks & PAPRs: Ensure the head harness and straps are correctly positioned and securely tightened.
Don’t Forget Fit Checks
Every time you put on your mask, you must perform a fit check, which is not the same as a fit test. A fit check confirms your mask is properly sealed at that moment, before entering a hazardous area.
A simple fit check involves blocking the filter and sharply inhaling or exhaling depending on the type of respirator, to confirm a good seal.
What Can Affect Your Mask Fit?
Several factors can compromise a respirator’s fit:
- Facial Hair: Beards, stubble, and sideburns in the seal area can break the mask’s seal.
- Other PPE: Glasses, goggles, helmets, and hearing protection can interfere with the fit. Fit testing should include all the equipment you’ll wear on the job.
- Any scars, beauty spots, moles, or piercings around the mask seal area.
Looking After Your Reusable RPE
A good fit is the start but a reusable mask must also be well-maintained:
- Regular Inspections: Check for damage, cracks, or worn parts.
- Keep It Clean: Dirt and clogged valves can affect protection.
- Replace Parts: Worn valve diaphragms or expired filters need replacing with genuine parts.
- Know When to Retire It: Follow manufacturer guidelines on the lifespan of your respirator.
The way your mask fits directly impacts your protection. Poor fit, facial hair, and incompatible equipment can all compromise safety. Fit testing is essential to make sure your mask works for you.
