The Glasfloss Z-Line 400 HW & HWR (Honeywell) is a replacement option for the Honeywell F-100 and FC40R air filters. The ZLine 400 HW & HWR incorporates 100% synthetic fibers that are thermally-bonded, and manufactured in an engineered gradient structure. The Z-Line 400 HW & HWR achieves a MERV 11 rating when tested in accordance with the ANSI/ASHRAE 52.2 Test Standard. Pre-applied gaskets on the assembled filters helps prevent air bypass. Each filter is sealed in plastic to avoid contamination before use. Glasfloss Z-Line Series Air Cleaner Replacement Filters utilize100% synthetic media that is laminated to a galvanized steel backing which stabilizes the media during operation. The pleats are formed in a radial configuration and controlled with separators on the air-entry side to ensure proper dust-loading. The pleated cartridge is encapsulated and bonded into a heavy-duty beverage-board frame to ensure filter integrity in high-moisture applications.