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BUILDING MATERIALS OF METAL, NAMELY, AIR TRANSFER DUCTS AND DUCT LINERS; NON-ELECTRIC CABLES AND WIRES OF COMMON METAL; IRONMONGERY, NAMELY, SMALL ITEMS OF METAL HARDWARE, NAMELY, WIRE CLAMPS AND BAND CLAMPS; TUBES OF METAL, NAMELY, FLEXIBLE, SEMI-FLEXIBLE AND RIGID TUBES OF METAL; GOODS OF COMMON METAL, NAMELY, UNION COUPLINGS FOR PIPES AND TUBES, NAMELY, SLEEVES, MUFFS, FLANGES, FLANGE SLEEVES, FLANGE MUFFS; PARTS OF VENTILATION INSTALLATIONS, NAMELY, METAL DUCTS AND FITTINGS, NAMELY, FLEXIBLE, SEMI-FLEXIBLE AND RIGID DUCTS; STAINLESS-STEEL DUCTS AND VENTILATION DUCTS FOR OIL TANKS; GOODS MADE OF METAL, NAMELY, CONNECTIONS FOR DUCTS, NAMELY, CLAMPS, SPIGOTS, CASINGS, MUFFS, FLANGES, FLANGE SLEEVES AND FLANGE MUFFS, RIGID, SEMI-FLEXIBLE AND FLEXIBLE DUCT SECTIONS, NOISE SUPPRESSION ELEMENTS, NAMELY, DUCT-LIKE SILENCERS FOR AIR CONDITIONING SYSTEMS; METAL AIR-SOURCE OUTLETS, CHIMNEYS, EXHAUST DUCTS

WEATHER PROTECTION VENTILATING LOUVERS