Metal ventilation channels, namely, ventilating ducts of metal, ventilating ducting systems of metal comprising metal ventilating ducts and metal vent covers and metal vent flaps, metal air conditioning ducts; metal ventilation grilles, namely, metal roof vents for ventilation, metal vent caps, metal air vents, metal vent flaps, metal vent cover for HVAC ducts, and metal air grids

Metal ventilation channels, namely, ventilating ducts of metal, metal air conditioning ducts, ventilating ducting systems of metal, comprising ventilating ducts of metal, metal air vents, metal air vent covers, and metal vent flaps; metal ventilation grilles, namely, metal roof vents for ventilation, metal air vent for fitting in walls, roofs and ceilings, metal vent flaps for fitting in walls, roofs and ceilings, metal vent cover for HVAC ducts, and metal air grids for fitting in walls, roof...