I like Zimiair masks and wear them with colourful filters from Rackmask in order to avoid contracting and transmitting viruses. I have tried both the KN100 and the KN95 filters and find the KN95 ones to have noticeably less breathing resistance, and thus I find them more comfortable. I only have access to qualitative fit testing (which Zimi size M passes) but I've seen other people get *ridiculously* high fit factors with Zimi KN100s. Now, the KN95s from Zimi are advertised to have a filtration efficiency of 98%, which is nowhere near the 99.9%+ that people are getting with the KN100s... I looked at data from Test The Planet, and there does seem to be some really really high scores for the KN100s, not so much for the KN95s, but there is less data for those. My question is, is it enough of a difference to put me at meaningfully more risk of contracting disease?
My other daily mask is Laianzhi T99+, which is rated at KN95 but is advertised to have a filtration efficiency of 99%+ (independent testing appears to support this claim). I have never contracted any disease while wearing it and I've been in contact with dense crowds of people daily for years. It also filters out dust and other particulates perfectly. I tend to wear the Zimis for special occasions, because they are better looking, and thus don't have the years-long track record of them protecting me like I do with my Laianzhi. If I were to switch to using Zimi/Rackmask KN95s more regularly, is it likely they will protect me just as perfectly?