The size of the double doors in rural fences is determined based on Feng Shui principles; generally the total width of the two doors should be 2.98-3.05 meters (2950-3000 is the "Ben", followed by Caizhi, Dengke, Enter treasure and prosper; 3000-3050 is the "wealth" gate; the order is "wealth and virtue, treasure house, Liuhe and Yingfu". The height should be 2.1-2.19 meters.
There are gates on both sides of the Luban ruler. Guangxing, Jiuliangxing, Qiu Gongsha, etc. are used to help the craftsmen choose the time to build the door.
The back of the Luban ruler is the Dinglan ruler, which is generally used to measure the dimensions around the shady house or for burial. The size of the tomb or the length and width of the tomb, good or bad, are divided into ten sections: "Ding, Harm, Prosperity, Bitterness, Righteousness, Official, Death, Prosperity, Loss, and Wealth". The above is the style of Luban Ruler, and there is also a Luban Ruler Behind the ruler is not the Dinglan Ruler, but eight stars, namely the Noble Star, the Natural Disaster Star, the Natural Disaster Star, the Heavenly Wealth Star, the Official Fortune Star, the Lonely Star, the Heavenly Thief Star, and the Prime Minister Star. They are mainly used in conjunction with the front.