IQAir CR PreMax F8 (XL) Anti-MicrobialQuick Overview F8 Pre Filter for Cleanroom H13 Antimicrobial non woven glass microfiber, mini pleated for high capacity Surface area: 7. 0m Efficiency of 55% at 0. 3 m (class F8) Filter Life: 21 months (approx) Filter Number: F1 Art. Number: The CR PreMax Filter F8 (XL) is used for the purpose of controlling coarse and fine particulate matter which provides protection of subsequent filters. The media used, is antimicrobial non woven glass microfiber,