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@Pantsmaster

We often have tool box talks with site operatives around PPE, RPE and respirator face fitting.

FFP1, FFP2, and FFP3 have different levels of protection depending on the level of protection the wearer requires. In a nutshell, the higher the level of the FFP respirator, the higher the protection against these airborne irritants, with FFP3 having the highest level of protection. No respirator can achieve 100% efficiency due to potential leakage around the face seal, valve (if present), and through filter penetration. Therefore, it's crucial to undergo a proper fit test and maintain a clean-shaven face to optimize the mask's fit

I hope this helps

https://www.hse.gov.uk/respiratory-protective-equipment/fit-testing-basics.htm

https://www.screwfix.com/p/jsp-force-8-medium-mask-respirator-with-press-to-check-filters-p3/1863f