72415613
Feb 14, 1972
Oct 15, 1974
DUCTS; PIPES; ELBOWS, T'S, AND CONNECTING FITTINGS FOR DUCTS AND PIPES; PIPE AND DUCT HANGERS AND CLEATS; PIPE AND DUCT EXTENSION; DAMPERS; STACK HEADS; FORCED AIR TRANSITION BOOTS; T-JOINT CAPS; DRAFT DIVERTERS; REGISTERS; GRILLES; AND COLLARS; ALL OF PREFABRICATED METAL FOR USE IN HEATING AND AIR CONDITIONING.
Environmental Control Apparatus