How about opening a small door next to the gate of Feng Shui Factory?

I think there is already a small door next to the gate of the ancient temple. Why? This is called the gate of hell, also called the back door. God enters through the front door, and ghosts enter through the small door. But Tiananmen Square in the Forbidden City also has a small door. Why? I think it's also to let ghosts in and out. Because the Forbidden City is too big, it is inevitable that there will be a small mess, so let it go out through the small door. But if it's a house, there can't be such a door, and it's dangerous to have one. For a factory, if it is big, it is good to have a small door, but it is inevitable to mix.