Snap-Lock Branch Duct · Straight Runs & Assembly
Snap-lock pipe offset with two elbows
Obstacle offset
ConnectionSlip-fit adjustable/fixed elbows
SupportSupport near each change of direction
Before you start
- Measure the true offset, travel, and available fitting length from fixed centerlines.
- Confirm the elbows can make the change without overextension.
- Check clearance to structure and access panels.
- Stage both elbows, center pipe, fasteners, sealant, supports, level, and tools.
Tools and materials
Two adjustable or fixed elbows, snap-lock center pipe, approved fasteners, sealant, level, tape, marker, supports near both changes of direction, and hand tools.
Lay it out
- Mark starting and ending centerlines.
- Measure offset and travel instead of guessing the center piece.
- Lay both elbows on the floor in the same plane.
Set and support it
- Preassemble on the floor when practical.
- Support near both direction changes.
- Lift at more than one point to prevent rotation.
Make the connection
- 1
Set both elbow angles to the measured offset.
- 2
Cut and snap the center pipe to the correct insertion length.
- 3
Connect the elbows while keeping them in one plane.
- 4
Lift and connect the upstream end.
- 5
Recheck the downstream centerline.
- 6
Connect the downstream end without springing the assembly.
- 7
Fasten, seal, and support every joint.
Check the install
- Both elbows lie in one plane.
- The branch reaches the intended centerline and elevation.
- No joint is under spring tension.
- Required clearances remain.
- Supports prevent rotation.
Common mistakes
- Cutting the center pipe from an eyeballed offset.
- Flipping one elbow and creating a compound offset.
- Forcing the final joint together.
- Using the offset to hide multiple route errors.
Stop and ask
Stop if available fittings cannot make the measured offset, the elbows must be overextended, access is blocked, or the route creates an excessive restriction.