It's important to check your respirator for the proper fit each time you put it on. Respirators can only work effectively if they fit correctly. A respirator that does not fit appropriately may allow contaminants to enter around the facepiece and be inhaled by the wearer.

Check your respirator for the proper fit each time you put it on. Follow these instructions for properly fit checking your respirator.

Types of Respirators
and Cartridges

Putting on (Donning)
Your Respirator

Fit Checking Your Respirator

How to Fit Test
Your Respirator

1. Cup both hands over the front of the mask (to cover the filter media) and inhale. Do not push on the mask.
2. Check to see if the facepiece pulls in toward your face.
3. If the mask is drawn in and no air leaks are detected around the facepiece, you have a proper fit. If you detect any leakage of air, try readjusting the nosepiece and/or the straps until you achieve a good fit.

Positive Pressure Fit Check:
1. Block the exhalation valve with the palm of your hand. 
2. Gently exhale and hold for about 10 seconds.
3. Check to see if the facepiece is bulging slightly.
4. If the facepiece remains bulging and there are no air leaks between your face and the facepiece, your respirator fits properly. If you do detect leaks, readjust the straps and check again for a proper fit.