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VCD - Volume control damper

Airflow characteristics

  • 78.9% free area for 48"x48" size

Free area table2 - square feet

Width - inches
12 18 24 30 36 42 48 54 60 72
Height - inches 12 0.58 0.94 1.29 1.65 2.00 2.36 2.72 3.07 3.43 4.14
18 0.94 1.53 2.11 2.69 3.27 3.85 4.43 5.01 5.59 6.76
24 1.31 2.12 2.92 3.73 4.54 5.34 6.15 6.95 7.76 9.37
30 1.68 2.71 3.74 4.77 5.80 6.83 7.86 8.89 9.93 11.99
36 2.00 3.23 4.46 5.69 6.93 8.16 9.39 10.62 11.85 14.31
42 2.33 3.76 5.19 6.62 8.05 9.48 10.91 12.34 13.78 16.64
48 2.69 4.35 6.00 7.66 9.32 10.97 12.63 14.29 15.94 19.25
54 3.02 4.87 6.73 8.59 10.44 12.30 14.15 16.01 17.87 21.58
60 3.38 5.46 7.54 9.63 11.71 13.79 15.87 17.95 20.03 24.19
72 4.07 6.58 9.09 11.59 14.10 16.60 19.11 21.62 24.12 29.14

Product Literature

VCD is a 4 inch deep volume control damper with weather-stopping J blades. It is ideal for controlling airflow in ducts or through wall openings. For pressure relief, or dampened intake/exhaust, see BDD - 2 or 4 inch back draft damper.

Dimensions and weight

Depth:
3.75 inches (95 mm)
Width:
Maximum 48 inches (1219 mm) per panel; Larger vents made of multiple panels
Height:
Maximum 60 inches (1524 mm) per panel; Larger vents made of multiple panels
Weight:
Approximately 3.4 lbs/sqft (16.5 kg/m2)

Width and height undersized by 1/4" to fit rough openings (unless otherwise specified).

Features and options

Construction

  • 0.081 inch (2.06 mm) thick aluminum extrusions
  • Blades move on 7/16 inch cadmium plated steel pins in Oilite® bronze bushings
  • 1/4" stainless steel linkage rod; Steel and bronze brackets
  • Assembled with cadmium plated screws and rivets

Frame

  • Channel frame for duct installation)
  • Flange frame (1" flange) for building installation (optional)
  • Reverse flange (rear flange) frame for surface mount1 or interior installation (optional)

Actuation

  • Motorized operation via long pin, for duct installation
  • Motorized operation via linkage actuator kit (optional)
  • Manual quadrant control (optional)

Linkage and control

  • Back-face linkage standard
  • Front-face linkage (optional)
  • Opposed-blade design (OBD) with front-face linkage, for airflow normal to surface (optional)
  • Multiple linkages for high velocity applications (optional)
  1. Sleeve or hood (not supplied) is recommended for surface mount.
  2. Free area computed using AMCA guidelines. Screen reduces free area to 83% of shown figures.