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The five color coded faces above each represent different face shape dimensions. They have differently shaped jaws, varying amounts of fat in their cheeks, and their noses are different.  When leaks happen between the seal of the skin and the N95 respirators, these often times tend to be around the upper part of the nose, where the nose meets the forehead and around the chin. So those with very slim faces tend to be harder to fit in these areas.

As stated before - respirators fit differently from person to person, hence why it is so important to do a formal fit test with any new respirator model before using it. Additionally, each time a respirator is donned, a user seal check should occur in accordance to the manufacturer's instructions. The user seal check is designed to expose the leaks in the seal between the respirator and the skin of the user.