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Fresh Air System Bellows Central Air-Conditioning Pipe Ventilation Duct Insulated Pipe, Find Details and Price about Fresh Air System Bellows and Central Air-Conditioning Pipe from Wannian County Xinlongsheng Environmental Protection Technology Co., Ltd. Featuring Antibacterial HDPE Material: Made of food-grade HDPE ensuring safe, sterile, and non-polar thermoplastic resin properties.