>>> Since my eyeglass arms are just thin wire, I'm now tightening the pull straps on the mask enough so that when I inhale I can feel a slight compression of the mask which indicates I have the needed vapor lock.<><><> Need to emphasize that the compression check needs to bee done each time the mask is donned, and probably intermittently during application. Bee sure to know how to conduct a seal check with your particular mask.
Mike in LA
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