What are the two most common types of elevator doors?

The two most common types of elevator doors are sliding doors and swinging doors. Sliding doors are prevalent in modern passenger elevators due to their space-saving design; they open by sliding horizontally along a track, which allows efficient access without requiring additional space for the door to swing open. This is particularly advantageous in tight spaces where a swinging door could impede movement or access.

Swinging doors, while not as commonly used in contemporary installations, are still found in some types of elevators, especially in older models or in specific applications. These doors open outward or inward like conventional doors, which can be beneficial in certain architectural designs.

The prevalence of sliding doors over the other options presented, along with their efficiency in operation and space utilization, underscores why they are favored in elevator systems. Other types of doors, such as revolving or accordion doors, are not typically used in standard elevator applications, and materials like glass or wood are more about aesthetics and do not define the door types used in elevators.