@uint8_t I'm having a little trouble understanding the filters for the Advantage 900. It seems like the P2 filters are appropriate if you're looking to minimise spread of airborne viruses? It doesn't equate them to P95/P100 or other standards I'm familiar with.
Their literature is a little vague on how long the filters last
If you have more thoughts on any of that, I would be keen to know!
https://cdn2.webdamdb.com/md_YE4IYteiEQL53IfD.jpg.pdf?v=1
https://za.msasafety.com/pn/10222869?locale=en
https://storestuff.s3.amazonaws.com/12943_129789693?response-content-disposition=attachment%3B%20filename%3D%221012-68-MC_Advantage-900_FAQs%252007.01.2022_EN.pdf%22%3B%20filename%2A%3DUTF-8%27%271012-68-MC_Advantage-900_FAQs%252007.01.2022_EN.pdf&AWSAccessKeyId=AKIAJBNEEVWEAALCCECQ&Expires=1723143387&Signature=DjilonGpq2ldsh53kzE7wH29vW4%3D