Material: Made of high quality material resistant to external factors (weatherproof and aging resistant stainless steel). Simple Design: Smooth surface, low air resistance. Installation: Suitable for wall mounting and duct mounting. Application: As an air inlet and outlet, installed in indoor ventilation equipment. Function: Fresh air ventilation inlet and outlet system. Flange connector High quality metal material, rustproof; Heat resistant. Easy installation for wall or ceiling in the house. Application in homes, basements, garages, offices and much more. Various uses: Use for heating and ventilation systems. Use it to connect your duct pipe to an outlet. Use in your tumble dryer, bathroom or kitchen exhaust duct and many other indoor and outdoor ventilation systems. Size: 100mm Quantity delivered: 1 piece