Thanks for posting! Have you had any issues with your glasses fogging up while wearing the new respirator? That has been one of the biggest problems I've encountered with dust masks and some respirators.
Normally, when your glasses fog up, it is because the respirator is not sealing correctly around the nose. People with skinny noses like mine, or abnormally wide ones have the most problems, and usually have better luck with the softer silicone rubber ones than the harder firmer rubber. The other problem could be the size. To large usually leaks over the bridge of the nose between the eyes (top inside of the lens fogs). Too small usually leaks around the nostrils, which fogs the whole lens).
Another common mistake is the strap adjustment. Too tight can be as bad as too loose, because it distorts the mask. One way to check the fit is to remove the filters (if possible. Otherwise cover them with saran wrap) and wearing nitrile or latex gloves, hold them gently over intake holes to make a seal. You should be able to inhale in and create a vacuum in the mask that will hold when you stop inhaling. If it leaks, and the culprit is not the exhuast port diaphragm leaking, try adjusting the straps to correct the leak. After this exercise, cover the outlet port and exhale, The mask should bulge slightly before it breaks the seal and releases the pressure. This step makes sure the inlet diaphragms are sealing.
If you can't stop the leaks, you probably need a different size providing the leaks are not caused by facial hair (which is usually around the chin, not the nose)
Back a dozen years ago when I wore one daily for work, the 3M ones fit me better than the MSA. With my small head (size 7 hat size) and a narrow nose, the 3M 6200 series in a medium size fit me the best (if that helps as a reference).
Hope this helps
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