... fesh air fan. ISO9001: 2000, ISO14001:2004, RoHS and CE ; Fresh air fan coil flexibe hose;DN:15~65MMUsed for fesh ... .ISO9001: 2000, ISO14001:2004, RoHS and CE ;1)Used for fresh air fan of air-conditioning, Durable, excellent flexibility, Notable vibration ... -60~+130Eduring strong pressureDN202.5-60~+130DN252.5-60~+130 Fresh air fan coil flexible hose