determine proper fit -- if the lens remains deflected, this give an indivation of an initial proper fit
Perform negative pressure check.
re-adjust the mask fit
perform negative pressure check
Before performing negative pressure check
Before performing negative pressure check
Before performing negative pressure check
Perform negative pressure check.
readjust the mask
Perform negative pressure check.
Make sure the filters are securely attached
perform negative pressure check
re-adjust the mask fit