Image of AC-21R
UL 521 Listed
Basis of Design
Multifamily Ready
Fast Lead Times

Air Control and Backdraft Dampers /Air Control Dampers /Commercial /Round (ID 85)

AC-21R

Round Control Damper

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Common Applications

  • Wood Truss Assemblies
  • Multifamily
  • Light Commercial

Resources

Product Sheets

  • PDF AC-21R product Sheet

Accessories

  • PDF Pull Chain Operator

Overview

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

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