Rectangular Reducer Ductwork
Rectangular reducer between two different duct sizes. UK-made to DW144, made to order. Instant online price, no account needed.
A rectangular reducer steps a duct down (or up) between two different sizes while keeping airflow smooth and turbulence low. It is used wherever the required cross-section changes along a run, such as after a branch has drawn off part of the flow.
- Category
- Rectangular Ductwork
- Standard
- DW144 compliant
- Made in
- UK (Knebworth, Hertfordshire)
- Lead time
- Made to order, fast dispatch
Common uses
- Reducing duct size after a take-off or branch
- Matching duct to smaller plant or grille connections
- Balancing air velocity along a run
Sizing & specification
Specify both the inlet and outlet width and height — the outlet cannot exceed the inlet. A gradual taper keeps pressure loss to a minimum.
Use the online configurator to enter your dimensions and receive an instant price. No account required. Add to quote and submit directly to us.
For bespoke orders or to discuss a project, contact us or call 07710 984 957.
Rectangular Reducer — frequently asked questions
Can the reducer be off-centre?
For an off-centre change of size use an Offset or T piece; a standard reducer is concentric to the run.
Which end is the inlet?
Either — the fitting works both ways. Specify the larger face as the inlet when ordering.
Related rectangular ductwork
- Rectangular Straight Length — Galvanised rectangular duct for straight runs — made to any size, e.g. 400x200 duct
- Rectangular Transition (Rect-to-Round) — Connects rectangular duct to circular spiral duct
- Rectangular Offset — S-shaped offset section for parallel duct runs