What role does Lu Banchi, a feng shui mascot, play in setting up homes?

Lubanchi is just one of the limited feng shui tools. It is not a mascot, nor does it have the function of turning evil spirits into houses. In fact, it is no different from the general ruler, but it is clearly marked according to the size to ensure that the height and width of the door (the inner frame of the door) conform to the auspicious size of Feng Shui when it is convenient to decorate.