特殊优质醚聚氨酯，内壁光滑，壁厚约 0.9 毫米， 加固：集成在墙壁中的铜涂层弹簧钢丝
- Safety guaranteed – no toxic gases emitted when caught on fire
- Polyester laminated ducting with encapsulated high tensile steel wire support
- High-resistant to fire and corrosion – gives the longer service life
- Durable finish, low maintenance required, lightweight
- Easy to install polyester flexible duct – reduces the number of joints in a run and eliminates the need for elbow and offsets