What is the negative pressure of a 30-meter chimney?

30 MPa. It is normal for chimneys to have negative pressure, which is also the ability of chimneys to inhale air. An annular partition is arranged every 30 meters in the ultra-high chimney, which acts like the sail of a sailboat. The greater the air speed, the greater the upward pull on the chimney. At the top of the chimney, the high-speed airflow is sprayed downward, which will also produce an upward reaction to the chimney. Therefore, the greater the airflow in the chimney, the stronger the upward pull on the chimney, which will offset the chimney.