TinnerFlow
Transitions & Reducers ยท Transitions & Reducers

Equipment discharge transition

Fan/AHU outlet

ConnectionFlanged/flexible connector
SupportIndependent structure support

Before you start

  • Confirm the equipment manufacturer outlet dimensions, airflow direction, transition geometry, flexible connector requirement, straight-section requirement, and service clearance.
  • Verify the transition does not create an abrupt turn or obstruction directly at the discharge.
  • Inspect equipment flange, transition, connector, and support arrangement.
  • Do not let the equipment casing carry duct weight.

Tools and materials

Approved equipment-discharge transition, manufacturer flange or adapter, flexible connector if specified, independent structural supports, gasket, compatible fasteners, sealant, level, laser, and service-clearance tools.

Lay it out

  1. Establish the equipment outlet centerline and downstream duct centerline.
  2. Confirm required straight length or fitting separation.
  3. Keep access panels, motors, belts, controls, and coil-pull areas clear.

Set and support it

  1. Install independent support for the transition and downstream duct.
  2. Support the flexible connector so it is not carrying weight.
  3. Hold the transition square to the equipment outlet.

Make the connection

  1. 1

    Verify the outlet dimensions and approved adapter.

  2. 2

    Set the independently supported transition.

  3. 3

    Install the flexible connector only where specified, without stretching or twisting it.

  4. 4

    Connect the equipment side.

  5. 5

    Align and connect the downstream duct.

  6. 6

    Seal required joints while keeping service access open.

  7. 7

    Release temporary support and verify the equipment casing does not move.

Check the install

  • The equipment carries no duct weight.
  • The flexible connector is relaxed, aligned, and not stretched.
  • The airflow path is smooth.
  • Service access remains open.
  • The transition is square and fully supported.

Common mistakes

  • Hanging the transition from the equipment flange.
  • Stretching the flexible connector to make up a gap.
  • Putting an abrupt elbow directly at the discharge without approval.
  • Blocking service access.

Stop and ask

Stop if the transition creates an unapproved fan system effect, blocks service, mismatches the manufacturer outlet, or transfers duct weight to the equipment.