curtain walls made primarily of metal; windows made primarily of metal; building wall framing made primarily of metal; skylight framing made primarily of metal; metal windows; metal doors; metal door frames; canopies and canopy supports made primarily of metal; metal awnings with opening and closing control device, sold as a unit; window blinds and shutters with horizontal slats made primarily of metal

curtain walls made primarily of metal; windows made primarily of metal; building wall framing made primarily of metal; skylight framing made primarily of metal; metal windows; metal doors; metal door frames; canopies and canopy supports made primarily of metal; metal awnings with opening and closing control device, sold as a unit; window blinds and shutters with horizontal slats made primarily of metal