Normal.
There is a large gap between the landing doors on each floor of the elevator. Some of the upper level elevator machine rooms also have vents, and the elevator shaft is very deep. The elevator goes up and down, it will of course push a lot of water into the elevator shaft. Air moves back and forth. If it is windy outside, the wind in the elevator passage will be even stronger.
Corridor wind is actually caused by the narrow tube effect.
When the air flow flows from an open area to a narrow area, because the atmosphere can be considered an incompressible fluid, the air mass cannot accumulate in large quantities. quantity in the narrow zone, so it accelerates through the narrow zone. zone, causing an increase in wind speed, called the “narrow zone tube effect”.
The corridor is a narrow area. When the air of the vast areaoutside flows into the corridor, a narrow tube effect is formed.