A non fit-tested N95 is a certified N95 mask approved by the National Institute of Occupational Safety and Health (NIOSH) that does not require a formal fit test, but does require a seal check.
A seal check is performed by the user each time the mask is put on. It will help determine if the mask is properly positioned on your face or if it needs to be readjusted.
How to perform a seal check:
- Put on the mask and adjust to fit securely
- Do either a positive pressure seal check and/or negative pressure seal check
- Positive pressure seal check: Exhale gently into the face mask. The face fit is considered acceptable when air can be built up inside of the face mask without air leaking out of the sides of the mask.
- Negative pressure check: Inhale gently so that the face mask collapses your breath for ten seconds. If the face mask remains slighlty collapsed and no outside air enters into the mask, the face fit is considered acceptable.
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