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The AstroHood II housings are designed to accommodate either gel seal HEPA/ULPA filters with depths of 80 mm (Type PHG), or gasket seal HEPA/ULPA filters with depths of 69 mm (Type CM). Depending on the application, filters with efficiencies of 99,995% (at MPPS), or optional ULPA filters with an efficiency of 99,9995% (at MPPS) or better can be used. For ease of installation and maintenance, the AstroHood II design enables filter installation and exchange from the room side. The housings have a single knife edge that forms an airtight seal as the knife edge interfaces with the gel (Type PHG), respectively the gasket (Type CM).