Ducts of metal for ventilating installations; Hardware, namely, metal brackets for general use; Ventilating ducts of metal; Metal hose fittings; Metal mounting brackets for general use; Metal joists; Gate hardware, namely, metal gate latches; Latches of metal; Metal pipe couplings and joints; Cantilevered brackets of metal; Metal hinges; Fittings of metal for compressed air hoses; Door fasteners of metal; Metal pipe supports; Gate latches of metal; Mounting brackets made primarily of metal fo...