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Baofeng has a 70 meter long cold drawing equipment, which enables the maximum length of heat exchange tubes to reach 53 meters. Combined with the introduction of bright annealing furnace equipment from South Korea and Japan, the heat exchange tubes have good dimensional tolerance, excellent internal and external surface quality, and good material performance. According to customer requirements, the heat exchange tubes can be cold bent or hot bent into U-shaped tubes, coil processing, etc。