Aluminum foil; Collars of metal for fastening pipes; Ducts of metal for ventilating and air-conditioning installations; Ducts of metal for ventilating installations; Fittings of metal for compressed air hoses; Metal clad pipes; Metal hose clamps; Metal pipe couplings and joints; Metal pipes and metal fittings therefor; Metal pipes for liquid and gas transfer; Metallic pipes and tubes; Ventilating ducts of metal