Ключевые слова: 2018, air, architecture, background, black, blue, building, chimney, cleaning, cloudy sky, construction, day, design, detail, domestic, duct, energy, equipment, exhaust, exterior, factory, fire, fireplace, home, house, industrial, industry, metal, modern, outdoor, pipe, pipes, power, roof, roofing, rooftop, sky, steel, structure, summer, system, technology, top, tower, tube, urban, ventilation, view,