Frame: 1 mm thick galvanized steel sheet.
Blades: 1 mm thick galvanized steel sheet.
Bearing pins: Electro plated steel rod of 10 mm diameter.
Bushings: Self oiling nylon bushings of internal square size.
Bearing pin connecting quadrant: Electro plated square steel rod of size 12.7 x 12.7 mm.
Quadrant: Locking quadrant with heavy gauge, electro plated steel.

Description:

Frame is constructed from galvanized steel sheet. Joints are welded and protected by aluminium spray coating.
Damper blade, which is fixed to the bearing pin, can be rotated in vertical plane from full open to full close.
Bearing pin is coupled with hand locking quadrant with open and close marking. Hand locking quadrant frame is marked to show exact position of damper.
Designed for use in heating, ventilating and air conditioning systems.

Accessories:

Motorized dampers: Volume control dampers will be supplied with actuators of client's choice. The dampers can also be provided with an extended linkage to fix the motor at site.

Dimensions:

Standard sizes:

D = Duct opening in mm dia
100	200	300	400	500	600

Model: ANRD-D

Construction:

Frame: High quality galvanized steel sheet.
Frame size: 125 mm depth and standard flange height of 25 mm.
Blades: Aluminium sheet as standard. GI sheet as option.
Blade supports: Self oiling nylon bushings with 8 mm diameter aluminium rods.
Blade seals: 20 mm x 20 mm aluminium angles.

Description:

Frame is constructed from galvanized steel sheet. Welded joints are protected by aluminium spray coating.
Air operated damper blades are fixed to the frame by self oiling nylon bushes with 8 mm dia aluminium pipes.
Blades are sealed with foam gasket 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 position of opening without fluctuating when there is constant air flow. Blades closes quietly when the air flow stops.
Designed to maintain a constant pressure level inside pressurized rooms. Used at duct outlets to prevent back draft when air moving devices are switched off.
In a multi fan installation non return dampers prevent back draft through the operating fans.
Structure is available with flanged edges and are supplied un drilled as standard.
Available in square and rectangular sizes.

Standard finishes:

Standard sizes:

Model: ANRD-W

Construction:

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

Description:

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 aluminium pipes.
Blades are sealed with foam gasket 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 position of opening without fluctuating when there is constant air flow. Blades closes quietly when the air flow stops.
Designed to maintain a constant pressure level inside pressurized rooms by relieving excess air when it exceeds the desired limit.
Generally installed on diesel generator, plant rooms ventilation system and exhaust ducting.
Available in square and rectangular sizes.

Model: AVCD

Construction:

Frame: 1.2 mm thick galvanized steel sheet.
Frame size: 125 mm depth and standard flange height of 25 mm.
Blades: Double skinned high quality extruded aluminium aerofoil profiles.
Bearing pins: Electro plated square steel rod of size 12.7 mm x 12.7 mm.
Bushings: Self oiling nylon bushings of internal square size.
Bearing pin connecting quadrant: Electro plated square steel rod of size 12.7 x 12.7 mm.
Blade linkage: Steel / aluminium linkage.
Blade stopper: 20 mm x 20 mm aluminium angle.

Description:

Frame is constructed from galvanized steel sheet. Joints are welded and protected by aluminium spray coating.
Blades are coupled by external concealed linkage, which can provide either parallel or opposed blade operation.
Linkage rods are coupled with hand locking quadrant with open and close marking. Hand locking quadrant frame is marked to show exact position of damper.
Structure is available with flanged edges and are supplied un drilled as standard.
Dampers without flanges available as option for duct insertion purpose. Flanged edges with drilled holes are also available.
Available in square and rectangular sizes.
Designed for use in heating, ventilating and air conditioning systems.

Accessories:

Motorized dampers: Volume control dampers will be supplied with actuators of client's choice. The dampers can be provided with an extended linkage to fix motor at the site.

Standard sizes: