The size of the arch has a positioning method:

1, according to the local average height;

2, according to the construction site design planning;

3. According to superstitious Feng Shui master, Lubanchi was used;

4. According to the design reference of famous historical buildings;

5, according to customer budget requirements.

I believe you already know the so-called average size, so it's good to communicate.

I hope it helps you.