Ключевые слова: aeration, air, alloy, background, building, circulation, clean facility, climate, construction, cool, corrugated, design, duct, ducts, ductwork, engineering, equipment, fabric, factory, flexibility, flexible, heat, hvac, industrial, industry, inside, manufacturing, many, material, metal, milk processing, modern, pattern, pipe, pipes, pressure, pvc, repair, tube, ventilation,