Hinge Kits, Fits Square Base Size 34 in, Compatible Grainger Part Number 56JN95, 56JP09, 56JP10, 56JP11, 56JP12, 56JP13, Material Galvanized Steel, Includes Curb Cap Channels (2), Curb Mount Channels (2), Hardware Kit, Reinforcement bracket, For Fan Type Downblast Fans, Upblast Fans, For Fan Mounting Type Roof and Wall Mount, Container Capacity Not Applicable, Standards AMCA, NFPA 96, UL 762, For Use With Belt Drive Exhaust Fan, Centrifugal Upblast Direct