... 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 ... ) They are the ideal substitutes of the traditional plastic flexible connector.6) JR-401, JR-402, JR-403, JR-404, JR ...