SheetMorph

Duct bends

Changes of direction in rectangular duct: cheeks, throat and heel. Each of these opens in the browser with default sizes that already give a verified flat pattern: change them to yours, check the drawing, add seam and flange allowances, and export.

Elbow

Elbows of rectangular duct, rolled to a radius or in mitered segments: two cheeks, a throat and a heel.

• Radius bend
• Segmented bend

Reducing Elbow

A rectangular bend whose width, or width and depth, change steadily from one end to the other.

• Width changes
• Width and depth change

Square-Throat Elbow

A rectangular elbow with a square inside corner, joined on one mitre, with or without turning vanes.

• Without vanes
• With turning vanes

Offset

A rectangular duct moved sideways between two parallel ends: an ogee of two curves, or a slanted piece on two mitres.

• Ogee (two curves)
• Mitred (slanted piece)

Round to Rectangle

A square-to-round whose two ends are at an angle: it changes shape and direction in one piece.

• Rectangle at End A
• Round at End A