... coil flexibe hose;DN:15~65MMUsed for fesh air fan.ISO9001: 2000, ISO14001:2004, RoHS and CE ;1)Used ... for fresh air fan of air-conditioning, Durable, excellent flexibility, Notable vibration absorbing, noise reduction ... configuration as well.4) They can lower the loss of heat and pressure by adopting the priciple of repairing flex. Besides, they are ...