... Co.,Ltd is one of the professional China black color flexible ventilation duct,Website:http://www.dxdxal.com, made ... life manufacturers and suppliers, and equipped with a productive black color flexible ventilation duct, made in china, long service life ... 1.6m, 1.8m, 2m, 2.4mStandard length: 10mStandard color: yellow, blackConnection: zipper connection, coiled connectionUsage: positive ventilation ...