Fan Mullion Pattern

By Huu Khanh Nguyen · Updated October 17, 2026 · LP101

A half-round fan of radiating mullion bars over a grid of equal lites.

Parameters

Name	Default	Unit
Width	488.95	mm
Depth	8.4755	mm
Height	641.35	mm
Bar Width	13.6	mm
Lite Columns	2
Lite Rows	2
Fan Lites	4
Bar Chamfer	2	mm
Fan Arc Segments	2 * Math.ceil(Math.PI / sectors / Math.acos(1 - 0.1 / (sizeX / 2)) / 2)
Arch Bar Radius	sizeX / 2 - barWidth / 2 / Math.cos(Math.PI / (2 * sectors * arcSegments))	mm