Is the exhaust in the bathroom of Yihe Palace Hotel connected with other rooms?

The exhaust in the bathroom of Yihe Palace Hotel is not connected with other rooms. The exhaust fan in the hotel bathroom can't pass through other rooms. The floors of the branch airway are not connected, but they all lead to the main airway. The exhaust fan is connected with a horizontal or vertical main pipe through a branch pipe. After the horizontal or vertical main pipes meet, a centrifugal fan is set on the roof to exhaust air. The centrifugal fan runs all year round, and the exhaust fan is usually turned on or off.