Glasfloss Replacement Pleated Air Filter, Z-Line 400 HW Series, Synthetic Fiber Media, Die Cut Beverage Board Frame, 16 in Width, 25 in Height, 4 in Depth, 11 MERV, 15.64 sq-ft Media Area, 300 fpm Rated Velocity, 0.09 in-WG Initial Resistance, .50 in-WG Final Resistance, 16 x 24-7/8 x 4-3/8 in Actual, 180 deg F, The 400 HW Series incorporate 100% synthetic fibers that are thermally bonded and manufactured in an engineered gradient structure. An expanded metal reinforcement shall be laminated to the air exit side of the media by a thermo-setting adhesive to maintain continuity of the radial pleats. The expanded metal shall be galvanized to resist rust and corrosion. Moisture-resistant separators are used to ensure pleat integrity during operation. The pleated cartridge shall be bonded to the peripheral interior of the outer frame. A heavy-duty moisture-resistant beverage board incorporating post consumer material shall be utilized for an encasing frame. The frame face shall be internally laminated to the pleated cartridge apexes. Each filter is sealed in plastic to avoid contamination before use. Made in USA. Glasfloss Z Series air cleaner replacement filters offer convenient alternatives when replacement of the original filter is necessary. The Z-Line 400 HW is a filter replacement option for the Honeywell F-100 cartridge filters.