Respirator Fit Test Comparison: Quantitative versus Qualitative methods

how much does it cost? $10K+? i bet

You need to make affordable Portacount versions for the public.

To see the amount of “men” falling for this shit is just disappointing.

For QLFT, it’s actually the noted threshold squeezes to begin the seven exercises in total, then half that amount every 30 seconds thereafter. This video states to spray the noted threshold number to begin each exercise. Not true.