Circle-to-Slot Air Duct Transition

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Bounding box: 238.4 × 124 × 190.9 mm
Engine: 3D Printing B-rep
Parameters: 11
Published: November 5, 2026

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The prompt

A hollow air duct transition, 2 mm wall thickness. It starts with a circular opening of 40 mm inner diameter and a 25 mm long straight tube section. It then smoothly lofts into a rectangular slot opening of 120 mm wide by 6 mm high (inner dimensions). The duct follows a curved path, a 110 degree arc with a radius of 160 mm, in a vertical plane. The inside cross-section area must decrease gradually and never be smaller than the slot area. All inside surfaces are smooth with no steps. The slot end has rounded edges with a 2 mm radius.

Parameters

Name	Value	Range
Inlet inner diameter	40 mm	10 – 120
Straight inlet length	25 mm	5 – 150
Slot inner width	120 mm	20 – 300
Slot inner height	6 mm	3 – 60
Wall thickness	2 mm	1.2 – 6
Bend angle	110 deg	10 – 170
Bend centre-line radius	160 mm	60 – 400
Slot inner corner radius	2 mm	0.5 – 10
Points per cross-section	96 mm	32 – 128
Sections along the bend	48 mm	12 – 96
Sections along the straight run	3 mm	2 – 16

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.

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