Thanks for this, its been a while since I did the training.

Excellent!

When you did a fit test and you got a reading which has a shaded yellow color, what does it mean, is this still okay or failed?

Do you need a new air hose (the twin hoses connected to the porta countvto the respirator) for each person that gets fit-tested? Or use the same hose for multiple participants?

This is measure particle size ..

Its chilling to watch how you can put those medical masks on, seemingly in the correct way, and still get a really shit fit. This is why Im using respirators during the pandemic.

as long as you havea beard and are not fully clean shaven of facial hair - you will never get a safe seal or reliable fit.