Ключевые слова: air, architecture, background, boiler, building, chimney, construction, country, design, energy, engineering, environment, equipment, exterior, factory, gas, gray, home, house, industrial, industry, iron, long, metal, modern, nobody, old, one, pipe, pipeline, pollution, roof, roofing, rooftop, sheet, single, sky, smoke, stack, steel, structure, system, technology, tile, top, tube, ventilation, view, white,