99.999% metal frame HEPA filters provide replacement particulate filtration for systems specifying this efficiency and frame construction. Spycor Environmental lists Koch Filter BioMAX CS minipleat filters with gasket, gel, or reverse-gel seals, alongside Glasfloss metal frame options.
Facility engineers and filtration specialists can compare actual dimensions, seal orientation, rated airflow, pressure drop, and documented efficiency test conditions. Match the selected filter to the housing’s sealing system and application specifications before ordering, rather than selecting by efficiency percentage alone.