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VOLUME CONTROL DAMPERS FAQS

Answers to your most Frequently Asked Questions about Greenheck volume control dampers.

Q:
Q:Does Greenheck offer an explosion-proof (NEMA 7) or weather-proof (NEMA 4) actuator?
A:
A:

Greenheck can provide factory installed 1, 3, 4, 4x, and 7 rated enclosures for actuators on volume control dampers. 

Q:
Q:Can an open close indicator (OCI) kit be field installed?
A:
A:

Yes, OCIs can be field installed on VCD by using the OCI kit (Part # 851848). On units less than 11 inches high with an A dimension of less than 10.5 inches, there will be no room to mount the OCI. Consult the factory on combination fire smoke dampers.

Q:
Q:Can an actuator be converted from internal to external mount, or external to internal mount on a Greenheck control damper?
A:
A:

Greenheck control damper actuators can change in the field from external to internal, and internal to external on most control damper models. Consult factory for details.

Q:
Q:What does 鈥渁ll stainless steel鈥� construction mean for commercial control dampers?
A:
A:When selecting a commercial control damper (VCD) with all stainless steel construction, the blades, frame, axles, bearings, blade linkage, jamb seals (when applicable), and jackshafting (when applicable) will all be stainless steel. Actuator linkages are not available in stainless steel construction. For dampers made entirely of 316 stainless steel, see the severe environment product line (model SEVCD).
Q:
Q:Does Greenheck offer thermally broken insulated blade and/or frame dampers?
A:
A:

Yes, Greenheck offers an insulated control damper (ICD series) that is constructed with a thermally broken blade and/or frame, which eliminates the transfer of cold or heat penetration and reduces condensation.

Q:
Q:Does Greenheck offer control dampers for applications with a temperature higher than 250掳F?
A:
A:

Yes, Greenheck offers heavy-duty/industrial control dampers for temperatures over 250°F.

Q:
Q:How does Greenheck interpret their drive arrangement definition? (Example: 22-2FER-2)
A:
A:
Q:
Q:What is the "damper location" under the configuration tab in CAPS庐?
A:
A:

The damper location for all Greenheck multiblade dampers (FSD, SMD, VCD and DFD, and DFDAF series) refers to the A dimension (the distance from end of sleeve to face of damper). The minimum allowable A dimension is 7.188 in. (182.6 mm). The damper location for curtain-style fire dampers (FD and DFD) refers to the K dimension (the distance from end of sleeve to centerline of damper frame).

Q:
Q:What is the difference between an open close indicator (OCI) and an auxiliary switch?
A:
A:

An OCI provides feedback to a control panel using a direct connection to the damper blades to indicate if the blades are in an open or closed position. An auxiliary switch is integral to the actuator that provides feedback using the stroke position of the actuator to indicate if the blades are in an open or closed position.

Q:
Q:What is the pressure drop for my specific control or multiblade damper?
A:
A:Greenheck leads the industry in AMCA rated products. Air performance certification provides an end user with accurate pressure drop information for the sizes required for certification. CAPS® also has a performance calculator for FSD, SMD, and VCD models and can provide individual damper pressure drop for all valid sizes.