what is the maximum wind speed of the main duct of the smoke exhaust system? The following provisions shall be observed:
1. According to the code for fire protection design of buildings, the wind speed of smoke exhaust system pipes shall meet the following provisions: when metal pipes are used, it should not be greater than 21 meters per second.
2. When nonmetallic pipes (note: mostly concrete air shafts) are used, it should not be greater than 1.5m per second.
Western food is a Western culture and way of dining, we are accustomed to the Western food are collectively called "Western food". Because western food is now accepted by Chinese people, the main g