There is a saying in geomantic omen, from the gas field, there is no house in the hospital.

As the old saying goes, it hurts people directly, and the gas field enters the room from the room, and the airflow should be S-shaped. Every day, good airflow and bad airflow will enter the room, and the bad airflow will make it not walk in a straight line, showing an S curve, reducing the harm to the human body. Good airflow will make it stay indoors for a long time, Fubao Chang (you don't understand this metaphysics).