When it rains, some rainwater will enter the door through the gap between the door strip and the window. After the door is opened, the water in the door will be discharged from the door outlet.
Door drain holes are very important for doors. If the door drain hole is blocked, rainwater will collect in the door.
If rain falls into the door, it will cause the door to rust, and even the door lock and window lifting mechanism will not work normally.