Taps & Takeoffs · Taps & Takeoffs
High-efficiency bellmouth tap
Rectangular plenum/main
ConnectionBellmouth flange
SupportIndependent branch support
Before you start
- Confirm bellmouth size, airflow direction, mounting surface, and branch route.
- Inspect the radius and flange for distortion.
- Verify the opening can be cut precisely.
- Check the plenum or main for internal conflicts.
Tools and materials
High-efficiency bellmouth tap, template, cutting tools, clamps, approved fasteners, sealant, branch support, and deburring tools.
Lay it out
- Mark the precise opening.
- Orient the bellmouth radius into the airflow as designed.
- Align the branch centerline.
Set and support it
- Support the main or plenum face if required.
- Clamp the bellmouth evenly.
- Provide downstream branch support.
Make the connection
- 1
Cut and deburr the opening.
- 2
Set the bellmouth in the correct orientation.
- 3
Align the branch outlet.
- 4
Clamp the flange flat.
- 5
Fasten evenly.
- 6
Seal the perimeter.
- 7
Connect and support the branch.
Check the install
- The radius is smooth and undamaged.
- The fitting is not installed backward.
- The opening is clean.
- The branch is aligned and supported.
Common mistakes
- Installing the bellmouth backward.
- Distorting the radius with clamps.
- Cutting a rough opening.
- Letting downstream duct pull on the fitting.
Stop and ask
Stop if the fitting is installed backward, distorted, or cannot seat fully on the mounting surface.