Snap-Lock Branch Duct · Straight Runs & Assembly
Snap-lock pipe with balancing damper
Branch airflow control
ConnectionDamper collar slip joints
SupportHangers on both sides when needed
Before you start
- Confirm damper size, blade type, handle orientation, and required testing-and-balancing access.
- Operate the blade through its full range before installation.
- Verify insulation and ceiling work will not bury the handle.
- Stage the damper, pipe, fasteners, sealant, hangers, marker, and tools.
Tools and materials
Round balancing damper, snap-lock pipe, approved fasteners, approved sealant, hangers, marker or label, screw gun, level, and hand tools.
Lay it out
- Choose a location where the handle remains reachable after insulation and ceiling closure.
- Leave enough open space for TAB personnel to operate the damper.
- Orient the shaft so the damper is not rolled.
Set and support it
- Support the branch so the damper body is not a hanger.
- Add support on both sides where required.
- Hold the damper orientation while both connections are made.
Make the connection
- 1
Operate the damper before installation.
- 2
Set the handle toward the planned access side.
- 3
Seat and fasten the first pipe connection.
- 4
Align and connect the second side without rotating the body.
- 5
Seal both joints without coating the shaft or mechanism.
- 6
Load the supports and operate the blade again.
- 7
Label or record the location if required.
Check the install
- The handle remains visible and reachable.
- The blade moves freely.
- The damper carries no branch weight.
- Both joints are seated, fastened, and sealed.
- Insulation will not bury the mechanism.
Common mistakes
- Putting the handle against the deck or hidden side.
- Sealing over the shaft.
- Letting the branch twist the damper.
- Closing the ceiling before access is verified.
Stop and ask
Stop if the handle will be inaccessible, the blade binds, the damper is damaged, or future balancing access will be blocked.