Maico AS 20 Backdraft Damper Non-Return Flap DN 100 White

The Maico AS 20 is a high-quality backdraft damper (non-return flap) designed to prevent air backflow, cold air ingress, and drafts in ventilation systems. With a nominal diameter of DN 100 (100 mm), it is suitable for use in domestic and commercial exhaust ventilation systems. The damper features two gravity/air pressure activated flaps that open automatically when airflow is present and close when the fan is off, ensuring energy efficiency by preventing heat loss.

Advantages

This non-return flap offers reliable protection against backflow, helping to maintain indoor air quality and thermal comfort. Its UV-resistant plastic construction ensures durability and long service life. The lightweight and compact design allows for easy, tool-free installation in standard 100 mm ducts or behind fans. Minimal airflow resistance and noise generation make it ideal for quiet operation.

Suitable for

• Exhaust ventilation systems in residential and commercial buildings
• Installation behind Maico fans (e.g., ER, ECA series) and other standard 100 mm ventilation systems
• Preventing cold air ingress and drafts in ductwork

Key specifications

• Product Type: Backdraft Damper / Non-Return Flap
• Nominal Diameter: DN 100 (100 mm)
• Material: High-quality plastic (ABS)
• Colour: White
• Number of Flaps: 2
• Opening Mechanism: Gravity/Air pressure activated
• Operating Temperature Range: -20°C to +60°C
• Airflow Direction: Unidirectional
• Installation: Tool-free, insertion into duct or mounting behind fan

Recommendations

For optimal performance, ensure the damper is installed in the correct orientation with the airflow direction arrow pointing away from the fan. Compatible with standard 100 mm ventilation ducts and Maico fan series ER and ECA.