Why should there be a large gap under the door of a public toilet?

Facilitates the flow of dirty air.

In public places, exposing private parts, embarrassing face, embarrassed, it's better to block it.

When people go to the toilet in public places such as shopping malls, parks, schools, movie theaters, hospitals and other places, have they ever wondered why there is such a large gap under the toilet door? ？This makes it easy for people to peek from the outside. >>>More

I've seen public toilets without partitions, but I've never seen soundproofing

1. Reduce the degree of corrosion at the lower end of the door; 2. It is convenient for ventilation and reduces the fumigation of dirty gases; 3. It is convenient for cleaning personnel to clean and find out whether there are toilet personnel; 4. Reduce the enclosed space, reduce the safety concerns of the timid people, and facilitate the communication between toilet personnel; 5. Save materials.