Reducers
Round and rectangular reducers, concentric or eccentric, with a straight length at each end. 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.
Concentric Round
A round pipe reducer on one centreline, with a straight length at each end: the cone and the two straights, each its own plate.
Open Concentric RoundEccentric Round
A round pipe reducer flat along its bottom, with a straight length at each end: the oblique cone and the two straights, each its own plate.
Open Eccentric RoundConcentric Rectangular
A rectangular duct reducer on one centreline, with a straight length at each end: each side one plate, folded where the taper begins and ends.
Open Concentric RectangularEccentric Rectangular
A rectangular duct reducer flat along one side or two, with a straight length at each end: each side one plate, folded where the taper begins and ends.
Open Eccentric Rectangular