Rectangular Transition (Rect-to-Round) Ductwork
Connects rectangular duct to circular spiral duct. UK-made to DW144, made to order. Instant online price, no account needed.
A transition connects rectangular ductwork to circular spiral duct, converting a rectangular face to a round spigot. It is the standard way to move between the two duct families on a single system.
- Category
- Rectangular Ductwork
- Standard
- DW144 compliant
- Made in
- UK (Knebworth, Hertfordshire)
- Lead time
- Made to order, fast dispatch
Common uses
- Connecting rectangular plant to spiral distribution
- Fan and air-handling-unit connections
- Joining rectangular risers to round branch runs
Sizing & specification
Specify the rectangular width and height plus the round diameter. Match the round end to the spiral duct or fitting it connects to.
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 Transition (Rect-to-Round) — frequently asked questions
Which spiral size should the round end be?
Match it to the spiral duct or fitting it connects to — see our spiral range for standard diameters.
Can it reduce as well as transition?
Yes — the round and rectangular faces can be different sizes, so the fitting transitions and changes area in one piece.
Related rectangular ductwork
- Rectangular Straight Length — Galvanised rectangular duct for straight runs — made to any size, e.g. 400x200 duct
- Rectangular Shoe — Boot / take-off connecting a round spigot to a rectangular duct face