Taps, Branches & Fittings ยท Taps, Branches & Fittings
Bullhead tee
Flow split
ConnectionFlanged/slip/gasketed
SupportDedicated fitting support
Before you start
- Confirm the bullhead tee is actually the approved fitting for the flow split.
- Verify inlet size, both outlet sizes, branch balance requirements, and damper locations.
- Inspect the fitting for internal obstruction and damaged ends.
- Field-check both outlet routes and available support.
Tools and materials
Bullhead tee, adjoining duct, approved joint components, fasteners, sealant, fitting support, branch hangers, level, marker, and hand tools.
Lay it out
- Mark the inlet and both opposing outlet centerlines.
- Confirm the fitting orientation matches the approved flow split.
- Coordinate dampers and access before lifting.
Set and support it
- Support the tee body independently.
- Support both outlets close enough to prevent leverage.
- Hold the fitting square while making the inlet connection.
Make the connection
- 1
Set and support the tee at the inlet centerline.
- 2
Connect the inlet.
- 3
Align and connect the first outlet.
- 4
Align and connect the second outlet without pulling the fitting sideways.
- 5
Install dampers where shown.
- 6
Seal all joints.
- 7
Load supports and verify the fitting remains square.
Check the install
- The fitting is square and supported.
- Both outlets align correctly.
- No joint carries branch weight.
- All connections are seated and sealed.
- Required balancing access remains available.
Common mistakes
- Using a bullhead tee where a wye is required.
- Letting one outlet pull the fitting out of square.
- Supporting only the inlet.
- Burying balancing dampers.
Stop and ask
Stop if the fitting selection, airflow split, outlet sizes, or balancing arrangement does not match the approved design.