Equipment, Flex & Terminal Connections ยท Equipment & Terminals
Fan discharge straight duct section
Fan outlet
ConnectionFlanged/flexible
SupportIndependent support
Before you start
- Confirm the fan outlet dimensions, rotation, discharge direction, required straight section, flexible connector, transition geometry, and service clearances.
- Inspect the fan flange, outlet, connector, and downstream duct.
- Verify the fan and duct are independently supported.
- Check the approved design before placing an elbow or wall immediately at the discharge.
Tools and materials
Straight discharge duct section, approved flexible connector if specified, flange hardware, gasket, fasteners, sealant, independent support, level, laser, and manufacturer instructions.
Lay it out
- Establish the fan discharge centerline.
- Reserve the required straight section.
- Keep fan access and motor service space clear.
Set and support it
- Support the fan independently.
- Support the discharge section from structure.
- Keep the connector neutral and unloaded.
Make the connection
- 1
Verify fan rotation and discharge orientation.
- 2
Align the straight section with the fan outlet.
- 3
Install the flexible connector without stretch or twist if specified.
- 4
Complete the equipment-side joint.
- 5
Set and support the straight section.
- 6
Connect the downstream transition or fitting gradually.
- 7
Inspect the airflow path and service clearance.
Check the install
- The fan carries no duct weight.
- The connector remains neutral.
- The straight section is aligned.
- No abrupt obstruction is placed directly at discharge unless approved.
- Service access remains open.
Common mistakes
- Installing an elbow directly at discharge without checking system effect.
- Using the connector to cover misalignment.
- Letting the fan flange carry the duct.
- Failing to verify fan rotation.
Stop and ask
Stop if an immediate elbow, wall, or abrupt transition creates an unresolved system effect, or if the fan and duct cannot be aligned and supported independently.