Ключевые слова: air, architecture, background, backgrounds, blue, brick, building, business, casing, climate, color, conditioner, construction, control, cool, cooler, design, duct, elements, engineering, equipment, factory, heat, heaven, industrial, industry, line, metal, metallic, modern, outside, pipe, pipeline, piping, plant, power, red, roof, sky, steel, structure, supply, system, technology, tube, tubing, urban, vent, ventilation, wall,