Mask Fit Testing System for Military Organizations Model M41
The M41 PATS tests how well a military gas mask fits the soldier. Modern military masks are capable of a high degree of protection, but ONLY if they are fitted correctly and donned properly. A mask that is capable of protection factors of greater than 10,000 may only give a protection factor of 50 if it is incorrectly donned or is not the optimum size. The M41 provides a numerical measurement of the Fit Factor of the mask while it is being worn by a soldier. The mask is tested in its normal operating configuration with the filter canister attached.