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A duct filter box designed for use with inline fans to circulate fresh air and block contaminants. Built with 1mm thick cold-rolled steel and aluminum duct flanges, able to withstand extreme weather. Slide lock door gives easy access to inner chamber while soft neoprene layer creates dust-free seal. Includes a standard MERV 13 filter that traps particles like viruses, dust, pollen, and mold spores. 23.46 x 8.42 x 11.73” | Fits 6” Inline Fans | 800 CFM Maximum | Accepts 12 x 20 x 1” Filters, Manufacturer: AC Infinity