Do N95 masks fit all face shapes and sizes?

Face Size and Fit Requirements

N95 masks are designed to fit snugly over the nose and mouth, with a gap of no more than 1 inch (2.5 cm) between the mask and the face. To ensure a proper fit, the mask should cover the nose and mouth completely, with no gaps or openings. The Centers for Disease Control and Prevention (CDC) recommends performing a fit test on each new N95 mask to ensure a proper seal.

Techniques for Ensuring a Proper Fit

To achieve a proper fit, individuals can use the following techniques:

• Tuck the mask under the chin to prevent it from shifting upwards.
• Adjust the mask to fit snugly over the nose and mouth.
• Make sure the metal nose clip is securely positioned over the bridge of the nose.
• Use the elastic straps to secure the mask to the head, with the straps positioned behind the ears.
• Check the mask for any gaps or openings by placing a lit candle near the mask; if the flame flickers or is extinguished, the mask is a good fit.

Mask Reuse and Fit Testing

When reusing N95 masks, it’s essential to perform a fit test after each use to ensure the mask remains a proper fit. This is because the mask may become misshapen or damaged during use, affecting its fit. Reusing N95 masks without a fit test can compromise their effectiveness in filtering out airborne particles. To perform a fit test, individuals can use a fit testing device or a simple method such as the “blower door” test, where a person blows air through the mask while sealing it around the face.