Ключевые слова: air, air duct, architecture, blue, chimney, construction, control, cool, cooling, cost, cutting, efficiency, engineering, environment, equipment, exhaust, factory, frame, heating, home, house, household, industrial, industry, metal, metallic, motion, natural, old, outdoor, pipe, plant, power, roof, silver, sky, space, spinning, steel, sunlight, temperature, texture, top, tube, turning, twisted, ventilation, ventilator, wind,