This is going to be a short one, but hey, it has to be said.
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It is possible to fit test a full face respirator with a crude adapter made of duct tape. Just make sure to remove the nosecup so you don’t miss sampling the exhalation valve. See this for more context.
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And hey, you might as well do a fit test with the nosecup, just to be sure it all fits nicely.
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A mysterious fit test failure with my PortaCount-connected-to-a-full-face-respirator also happened to be caused by a broken exhalation valve. Who knew?
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For those interested, this particular failure occurred after deep breathing, and during the side-to-side exercises.
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So, if you even a little suspicious your exhalation valve has been slightly warped from use, best to assume it has been.
Fun fact: That giant hole made through the pictured full-face-respirator’s lens is an adapter from Dynatech Frontier. If you had any idea what I just said, please go to the microblog section through this link.