Ключевые слова: air, air ducts, architecture, boiler, chimney, city, conditioner, conditioning, construction, cooling, duct, energy, engineering, environment, evening, exhaust, exterior, factory, heat, heating, home, house, hvac, industrial, industry, metal, metallic, modern, new, outdoor, pipe, pipeline, pipes, plant, power, roof, roofing, rooftop, sky, stainless steel, steel, structure, sunset, system, top, tube, vent, vent pipe, ventilation, ventilation pipes,