Which door type is described as revolving?

• A. Swinging (inward and outward)
• B. Revolving
• C. Sliding
• D. Overhead

Answer: (B)

Revolving doors rotate around a central axis, using several panels that turn together like a wheel. This is different from swinging doors, which are hinged to swing inward or outward; sliding doors, which move horizontally along a track; and overhead doors, which raise up or roll overhead. So the door described as revolving is the one that spins around its central axis. In practical safety terms, revolving doors control entry tightly but can slow down evacuation, which is why they’re often paired with additional exit options.