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When fitting a new respirator, try on several brands and sizes when possible. Different brands will fit slightly differently on your face. You may be asked to talk, move your head/face, or make other movements to determine if the respirator is a good choice for you. You may also be asked to remove facial hair where it interferes with the seal between the respirator and skin.
The fit of your respirator should be evaluated periodically. For example, if you have lost or gained weight or have been fitted with new dentures, the shape of your face may have changed. Therefore, the fit and seal of your respirator may change.
See the OSH Answers document on Respirator Selection for more information.
Respirator users should always:
Elastomeric facepieces are made of silicone, thermoplastic, or rubber material. One or more filters or cartridges are attached to the facepiece.
Always follow the directions provided by the manufacture and your employer. These instructions describe how to put on a reusable elastomeric half-facepiece. Full face respirators would follow a similar process.
In general, adjust the straps so that the respirator fits tightly but does not dig into your face or leave red marks on your skin. The respirator should feel snug but comfortable. Straps should be placed under a hard hat or hood. Position the straps correctly – one strap should go above the ears and over the crown of your head, and the other below the ears and around the neck. If the respirator has adjustable straps, tighten or loosen them without removing the respirator.
Figure 1: Procedure for putting on a half-facepiece respirator
Filtering facepiece respirators are those respirators in which the entire facepiece acts as the filter. These respirators usually cover half of your face, and are sometimes called "disposable" respirators.
In general, hold the respirator in your hand with the nosepiece near your fingertips. Place the mask over your nose and mouth, and hold with one hand. Using your other hand, pull the top strap over your ears. Pull the bottom strap behind your head and below your ears. If there is a clip, clip it behind your neck. If there is a metal nosepiece, mould it around your nose to create a proper seal.
Figure 2: How to put on a disposable respirator
Each time and every time a respirator is worn, you must check that the respirator is sealing properly to the face. Not all respirators will allow the wearer to temporarily block the inlet openings or valves, but these checks should be done whenever possible. Do not wear a respirator that does not seal properly.
Negative pressure seal check: Negative-pressure checks can be done on air-purifying respirators and other respirators with a tight fitting facepiece.
Figure 3: Negative pressure fit check
Positive pressure seal check: Positive-pressure seal checks can be done with respirators equipped with tight-fitting facepieces that have both inhalation and exhalation valves.
Seal checks for disposable respirators: A seal check can be done by placing both hands over the respirator itself, or by using a device provided by the manufacturer.
Again, do not wear a respirator that cannot pass the seal checks successfully.
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Although every effort is made to ensure the accuracy, currency and completeness of the information, CCOHS does not guarantee, warrant, represent or undertake that the information provided is correct, accurate or current. CCOHS is not liable for any loss, claim, or demand arising directly or indirectly from any use or reliance upon the information.