Dampers, Penetrations & Life Safety · Dampers & Life Safety
Control damper section
Air-control system
ConnectionFlanged duct connection
SupportIndependent support
Before you start
- Confirm damper size, blade type, leakage class, actuator, control sequence, straight-approach requirement, and service clearance.
- Inspect frame, blades, seals, linkage, actuator, and mounting holes.
- Verify the damper section is independently supported.
- Coordinate controls and access before connection.
Tools and materials
Control-damper section, flanged duct components, gasket, compatible fasteners, actuator and controls, independent supports, level, square, and manufacturer instructions.
Lay it out
- Establish inlet and outlet centerlines.
- Orient actuator and linkage for service.
- Reserve the required approach and access space.
Set and support it
- Support the damper section independently.
- Support both adjoining ducts.
- Keep the frame square during fit-up.
Make the connection
- 1
Set the damper section level and square.
- 2
Connect the first flange evenly.
- 3
Recheck blade and linkage travel.
- 4
Connect the second flange.
- 5
Install actuator and controls.
- 6
Seal connections without obstructing movement.
- 7
Cycle and commission the damper.
Check the install
- The frame remains square.
- The actuator reaches full travel.
- The linkage is clear.
- The damper carries no duct weight.
- The control response matches the approved sequence.
Common mistakes
- Using flange bolts to pull a racked frame straight.
- Blocking linkage with insulation.
- Hanging duct from the damper section.
- Skipping functional testing.
Stop and ask
Stop if the damper is carrying duct weight, the control sequence is unknown, or the actuator and linkage cannot be serviced.