Types of fire doors include:

• A. demising stationary.
• B. overhead rolling.
• C. frangible folding.
• D. automatic opening.

Answer: (B)

Fire doors are built to resist heat and slow the spread of flames, and they come in several configurations based on how they operate. An overhead rolling door fits this concept because it is a fire-rated door that moves up and rolls into a header above the opening, sealing the space when closed. This design is especially useful for large openings in places like warehouses or service bays, where a strong, quick-sealing closure is needed to block fire and smoke.

Other terms don’t describe a door type in the same way. Demising refers to a separating wall rather than a door configuration, frangible folding isn’t a standard fire-door classification, and automatic opening describes how a door operates rather than its structural type.