Ключевые слова: air, air duct, aircondition, aluminum, background, big, blank, building, ceiling, chrome, clean, cold, condenser, conditioner, contemporary, cooling, duct, ducting, equipment, exhaust, factory, fan, gray, group, heat, hose, indoors, industry, machinery, metal, modern, new, nobody, part of, pattern, pipe, pipeline, profiled, shiny, silver, sparse, stainless, steel, striped, structure, system, technology, tube, vent, ventilation,