Mid mounted fast doors typically have good durability as they are designed for frequent opening and closing operations and are suitable for high flow industrial environments. Its durability mainly depends on the following factors:

1. Materials: High quality materials such as PVC, aluminum alloy, etc. can improve durability and impact resistance.

2. Structural design: Reasonable structural design can reduce wear and extend service life.

3. Maintenance: Regular maintenance and inspection can ensure the normal operation of the quick door and prevent malfunctions.

4. Operating environment: The durability of doors may vary in different environments, such as extreme weather or special industrial conditions.

Overall, if the appropriate model is selected and properly maintained, the mid mounted quick door is a relatively durable choice.