What is the auspicious number of the door opening on Luban ruler?

The auspicious numbers of the door openings on the Luban ruler:

If converted to metric sizes, the usual auspicious numbers are 21-23cm, 40-42cm, 60-62cm, 81cm, 88cm, 89cm , 106-108cm, 126-128cm, 133cm, 146cm, 155cm, 171-176cm, 191-198cm, 211--216cm, 231-236cm, 241cm, 253-256cm, 261-263cm, 275cm, 281-283cm.

Generally speaking, the height of modern doors does not exceed 283cm. For ordinary residences, the width of the door (i.e. the visibility, which is the horizontal distance of the inner wall of the door frame, excluding the thickness of the door frame) is mostly 108cm, and the height Most are about 212cm, while the width of the door is mostly 81cm, and the height is mostly 198cm. This size is suitable for everyone. Extended information

Luban ruler, the full name of "Luban construction ruler", also known as "Luban ruler", is a measuring tool used in building houses, similar to the curved ruler used by craftsmen today. The Luban ruler is about 42.9 centimeters long. According to legend, it was made by Gongshuban of the State of Lu in the Spring and Autumn Period. Later, the eight characters were added through the Feng Shui community to measure the good and bad luck of the house, and it was called the "door meter ruler".

Also known as "square ruler", it is a woodworking tool mainly used to check whether the planed boards, planks and structures are vertical and at right angles to the edges. 1 city ruler = 0.8 Luban ruler. Luban ruler was integrated with Dinglan ruler soon after its creation, and later with inches and centimeters. It is an important tool for measurement and correction. Due to its special functions, it is most widely expressed in Feng Shui culture and architectural culture.

Reference: Baidu Encyclopedia-Luban Ruler