Gray Metal 307 6X4X4-307 Flue Wye Branch, 6 x 4 x 4 in, 26 ga

Gray Metal 110R Series 10X4X4-110R Register Boot, 10 in L Register Opening, 4 in W Register Opening, Galvanized, Steel

Gray Flex R84SF, 4 in Duct, 25 ft Length, Polyester, R-Value: 8

Gray Metal 400A Series 6-400A Adhesive Starting Collar, 6 in, 5-1/2 in H, 26 ga

Gray Metal 400A Series 10-400A Adhesive Starting Collar, 10 in, 5-1/2 in H, 26 ga

Gray Metal 311 Series 6X4-311 Reducer, 6 x 4 in, Crimped Small End, 26 ga, Steel

Gray Metal 113R Series 10X4X4-113R Angle Boot, 10 in L Register Opening, 4 in W Register Opening, Galvanized, Steel