Model AC-21R

Round Control Damper
Triple-V Single Blade

AC-21R control damper employs a sturdy round frame and triple-V blades for automatic air control and manual balancing in low to medium pressure and velocity applications.

Standard Construction

Frame: 2" x 16 ga. (51 x 1.6) galvanized steel.
Blades: 14 ga. (2.0) equivalent galvanized steel-round.
Axles: 1/2" (13) diameter plated steel.
Linkage: Concealed in frame.
Bearings: Synthetic.
Control Shaft: 1/2" x 3" (13 x 76) drive axle. 
Minimum Size: 5 Ø (127 Ø)
Maximum SIze: 24" Ø

Ratings

Maximum System Velocity: 1500 fpm (7.7 m/s)
Maximum System Pressure: 1.0 in. wg. (0.25 kPa)

Temperature: -25^oF to 180^oF (-32^oC to 83^oC)