Ключевые слова: aeration, air, air duct, airing, blue, boiler, building, chimney, conditioning, cooling, duct, equipment, eternit, exhaust, exterior, factory, flue, from, fumaria, heating, industrial, industry, modern, natural, natural gas, pipe, pipeline, pipes, plastic, pollution, roof, roofing, sky, steam, technology, terminal, tube, vent, ventilation, wall, white,