Duct Return Air Boxes

Gray Metal 317MHB Series 14X20X14-317MHB Mobile Home Box, 14 in L, 20 in W, Sheet Metal

Gray Metal 3900 Series 3900-12X12X08 Insulated Return Box, 12 in L, 12 in W

Gray Metal 3900 Series 3900-14X14X08 Insulated Return Box, 14 in L, 14 in W

Gray Metal 3900 Series 3900-14X20X08 Insulated Return Box, 14 in L, 20 in W

Gray Metal 3900 Series 3900-20X25X08 Insulated Return Box, 20 in L, 25 in W

Gray Metal MHB Series 14X20X14-MHB Square to Round Box with Filter Rack, 14 in L, 20 in W

Gray Metal MHB Series 14X20X16-MHB Square to Round Box with Filter Rack, 14 in L, 20 in W

Gray Metal MHB Series 14X24X14-MHB Square to Round Box with Filter Rack, 14 in L, 24 in W

Gray Metal MHB Series 14X24X16-MHB Square to Round Box with Filter Rack, 14 in L, 24 in W

Gray Metal MHB Series 16X20X14-MHB Square to Round Box with Filter Rack, 16 in L, 20 in W

Gray Metal MHB Series 16X20X16-MHB Square to Round Box with Filter Rack, 16 in L, 20 in W

Gray Metal MHB Series 20X20X14-MHB Square to Round Box with Filter Rack, 20 in L, 20 in W