Fantech Air Exchanger Filter Kit 414923 (2-PACK) Filter,MERV8,100 cfm,Repl.kit MERV8 Filter kit, 100 cfm, 2 pcs, 8.4″x12.4″ Item Number: 414923 Replacement filter kit features 2 cleanable synthetic filters with MERV8 rating. The filters will collect mold spores, pollen, cement dust, carpet fibers, debris, lint, and insects. With normal usage, it is recommended that you vacuum clean the filter every month, and replace every 3 months. The kit includes 2 filters. Fits the following fantech air exchangers: FLEX 100H, FLEX 100H ES, VER100, VHR100 RES