1. use red fiberglass, more healthy
2. good product quality

Main Product Specifications:

Diameter Rang: 4''~20'' (102-508mm)

Temperature Rang: -30°C ~140°C

The Highest Air Flowing Speed: 30m/s

The Largest Work Pressure: 2500Pa

Standard Length: 10m

Flexible Aluminium Duct are made of Iaminated Aluminium foil with strong helix steel wire.Apply for low/medium/high pressure air ventilation and condition systems.Easy to install oval or round connection.At high temperatures or in case of fire,no toxic gas emission.