Non Return Damper – ANRD

Frame: High-quality extruded aluminum profile with 30 mm flange width as standard. 12, 16, and 24 mm flange widths are optional.
Blades: Extruded Aluminium profile
Blade supports Self-oiling nylon bushings with 8 mm diameter aluminum rods.
Blade seals: Foam gasket for air tightness.
Blade stopper: 20 mm x 20 mm aluminium angle.

The non-return damper is an HVAC damper used in areas where the air is supposed to flow only in one direction. Non-return dampers can be mounted on the wall or duct, depending upon the application. They are most commonly found being used in front of fans where the blades are opened only when the fan starts and the blades close due to gravity when the fan stops. 

• The non-return damper is designed to allow airflow in one direction.
• The frame is of high-quality extruded aluminium profiled construction with the advantages of corrosion resistance and rigidity.
• Air-operated damper blades are fixed to the frame by self-oiling nylon bushes with 8 mm dia aluminum pipes.
• Blades are sealed with foam gaskets at the bottom to avoid rattling noise and to provide air-tight operation.
• Blades open full or to any angle depending on the air velocity. Blades stay in a position of opening without fluctuating when there is constant airflow. Blades close quietly when the airflow stops.
• Designed to maintain a constant pressure level inside pressurized rooms by relieving excess air when it exceeds the desired limit.
• Generally installed on a diesel generator, plant rooms ventilation system, and exhaust ducting.
• Available in square and rectangular sizes.

Application: Air intake, zone isolation, etc.

Standard Finishes:

• Natural anodized aluminum finish.
• Powder-coated color finish as per RAL color codes.
• The flexibility of finishing is available as options

Model: ANRD-W – Wall mounted

Model: ANRD-D - Duct Mounted 

Model: ANRD-Duct Mounted