Square-to-round transition preview
Configure a rectangular, square, round, or offset transition and generate a deterministic CAD preview for quote planning. FortiFab reviews final manufacturability before production.
Live CAD preview
3D model when the CAD worker is available; deterministic 2D drawing always.
Quote-ready preview
Your dimensional spec and preview drawing go with the request — FortiFab confirms manufacturability, seams, and flanges before production.
- Length
- 18.0 in
- Blank est.
- —
- Bounding box
- —
Metrics come from the last generated preview.
Configure transition
All dimensions are in inches; the backend normalizes to millimetres for CadQuery rendering. Edits are solved server-side — use Update preview after changing values.
Inlet shape
Width × Height
Width
Height
Outlet shape
Galvanized steel — default 0.06″ ≈ 16 ga sheet.
Offset
X
Y
Lateral shift between the inlet and outlet centrelines. Use 0 for a concentric reducer.
Settings are saved automatically in your browser.
Generated outputs
Use these as preview artifacts; production quoting still routes through FortiFab review.
CAD code
Deterministic CadQuery loft code is generated server-side from the canonical spec.
3D preview
GLB/STEP/STL are returned when the CadQuery worker is available.
Your quote summary
Attach or paste this summary when you request your quote — it gives FortiFab the details needed for manufacturability review.
- Inlet
- Rectangular · 14″ × 10″
- Outlet
- Round · Ø8″
- Length
- 18″ (457 mm)
- Offset
- 2″ X · 0″ Y
- Wall
- 0.06″ galvanized steel
- Blank estimate
- Pending preview
- Bounding box
- Pending preview
- Renderer
- CadQuery route
- Review notes
- None from the current preview.
Duct transition preview guide
Preview duct reducers and transitions before fabrication review
Use the configurator to describe rectangular, square, round, offset, and square-to-round sheet-metal transitions. FortiFab can use the dimensional summary with drawings or sketches to review material, seam, flange, and manufacturability details.
Common searches
- custom duct reducer
- square to round transition
- rectangular to round transition
- sheet metal duct transition
Best buyer use cases
- HVAC and process-air transition pieces
- Offset reducers where clearance and length matter
- Preview-backed quote requests for ducting and air-handling work
Ready to turn this into a reviewed fabrication quote?
Send drawings, sketches, material, thickness, finish, quantity, and any fit-up requirements so FortiFab can review manufacturability.
Duct reducer and transition FAQs
Planning notes for custom duct reducers, square-to-round transitions, offsets, seams, and quote review.
CAD preview
Awaiting preview