Below are the features of Aluminum Flexible Duct 
Detailed Product Description
1.silent flexible ventilation duct durable material made of flexible duct+insulated fibreglass+ aluminium foil..
2.Apply for low /medium / high pressure, use for air ventilation in each environment .
3.Rectangle style, and easy to install .
4.Fireproofing,at high temperatures or in case of fire ,no toxic gas emitted .
5.Easy to delivery .
6.Our price is lowest , the quality is perfect , and the delivery will be prompt .