Because the chimney is an exhaust device. I feel uncomfortable going in and out every day. If the wind blows the waste gas and sucks it into your body, it will be even worse. Of course, it will affect your fitness, churches and other religious buildings, because the other side is clean, it will affect the business of your own shop, and the bustling atmosphere in the shop will also affect the temple teaching, which is not good. There must be no ill-fated buildings such as hospitals and toilets opposite the company gate. But smaller than the other one, that is a bad model, and there will be a saying that it will be eaten. At this time, just build a canvas awning in front of your house and pull it to the sidewalk to change it. In ancient times, it was called horn demon. It looks like a straight knife, fierce, which is not conducive to construction and wealth. From a modern point of view, from the door to the outside, half is a wall and half is a big space.
Psychologically speaking, being cut in half is not good. In terms of halo, the airflow between the two halves is completely unbalanced, which is really not a good model. An empty room cannot face the narrow alley between two buildings.
In ancient times, it was called killing evil spirits, just like a knife falling from the sky. In ancient times, it was said that family games would not flourish. From a modern point of view, the empty room between high-rise buildings opposite the door is an outlet that is easy to produce large airflow. It is often said in geomantic omen that flowing clouds will affect the stability of one's aura. Of course there are buildings.