Equipment, Flex & Terminal Connections ยท Equipment & Terminals
VAV discharge rectangular duct
Terminal outlet
ConnectionFlanged or slip outlet
SupportIndependent duct support
Before you start
- Confirm the VAV discharge dimensions, transition or connector detail, reheat-coil location, access-panel clearance, and outlet support.
- Inspect the casing, flange, gasket surface, and downstream duct.
- Verify the discharge duct will not load or distort the VAV casing.
- Coordinate controls, reheat service, and access before installation.
Tools and materials
VAV discharge duct, approved flanged or slip-joint components, gasket, flexible connector if specified, fasteners, sealant, independent support, level, and hand tools.
Lay it out
- Establish the discharge centerline and elevation.
- Keep service and reheat access clear.
- Confirm the transition does not block panels or controls.
Set and support it
- Support the VAV independently.
- Support the discharge duct before closing the joint.
- Keep the flange faces square and parallel.
Make the connection
- 1
Set the discharge duct to the VAV outlet.
- 2
Install gasket or flexible connector if specified.
- 3
Bring the joint together without pulling on the casing.
- 4
Install fasteners evenly.
- 5
Seal the joint.
- 6
Load the duct support.
- 7
Check the casing for distortion and confirm all panels open.
Check the install
- The VAV casing remains square.
- The discharge duct is independently supported.
- The joint is fully seated and sealed.
- Reheat and control access remains open.
- No transition blocks service.
Common mistakes
- Hanging the discharge duct from the VAV.
- Using bolts to pull misaligned flanges together.
- Blocking the reheat coil or access panel.
- Stretching a flexible connector.
Stop and ask
Stop if the discharge transition blocks service, the casing distorts, the outlet size is wrong, or the duct cannot be independently supported.