prefabricated ventilating floors and separators of flue gas, oil mist and other similar substances for industrial applications; kitchen ventilating equipment and apparatuses and their parts, namely oven ventilating hoods, prefabricated kitchen ventilating ceilings, profiled oven hoods and grease-trapping grilles; [heating, sanitizing] ventilating and air conditioning units; [oil furnaces and] replacement parts and elements for the above