Shape: Round Pressure: 2500 pa Air: 30 m/s High temperature resistant, corrosion resistant, lengthy lasting. Built-in steel twine for reinforcement and lasting performance. Perfect for heating ventilation, air conditioning, kitchen, bathroom, greenhouse, grow room, develop tent, etc. colour:Silver Material:aluminum size:Diameter: 100mm Length: 3meter Package Contents: 1 x air flow duct Only the above equipment content, diversified merchandise are not included. Note: Light capturing and diversified exhibits could cause the colour of the item within the photo a bit of varied from the real thing. The size allowed error is +/- 1-3cm.