The gate is calculated as the gate on the first floor, which leads directly to the outside and is greatly influenced by the ground environment: the upstairs door is calculated as the gas port.
From the perspective of geomantic omen, it can be changed, but the size of the door on the second floor cannot be larger than the main entrance on the first floor. The main entrance on the first floor is open to the public, dignified and brightly lit. The second floor is the second door, which is smaller than the main entrance. At the same time, collecting gas is also collecting money. If the second door is the same as the main door, it means "how much is there", so it is taboo.