ALT Screenshot from linked page. Over a photo of a person with long brown hair molding the nose wire of a 3M Aura to their face, text reads: Four Steps to At-Home N95 Mask Fit Test Of course, it’s not as accurate as a real test, but it will help you identify big leaks. It’s simple: 1. First put on the mask. Make sure the metal bar is bent tightly around your nose. 2. If the mask has two straps, make sure one strap is below your ears and one above like this:

ALT Text continues: 3. Next, lightly hold the mask in place and inhale sharply. While inhaling, pay attention to see if you feel a sensation of air or coolness around the edge of the mask. Pay particular attention to the area around the nose. 4. If you feel air leaking, adjust the mask and try again. After adjusting, if the mask is still leaking, try a different model. Below this text is an image of a 6 step graphical instruction for properly donning and seal testing a trifold mask.

ALT Over a photo showing a valved 3M Aura labelled "valve" and a valveless 3M Aura labeled "no valve," text continues: If Your Mask Has a Valve If your mask has an exhalation valve, you can only do the test while breathing in. But if your mask has no valve, you can also do the test both while breathing in and out.