Ключевые слова: air, architecture, background, blue, building, business, chimney, city, conditioner, construction, design, duct, electric, electricity, energy, engineering, environment, equipment, exhaust, exterior, factory, heat, industrial, industry, infrastructure, line, manufacturing, metal, metallic, modern, oil, pipe, pipeline, plant, pollution, power, production, roof, sky, smoke, steel, structure, system, technology, tower, vent, ventilation, wall, warehouse, white,