What kind of pressurization system uses fans to create a pressure barrier in elevator hoistways?

Elevator hoistway pressurization specifically refers to a system designed to maintain a higher air pressure within an elevator hoistway compared to the surrounding areas. This pressure barrier is achieved through the use of fans that actively push air into the hoistway, preventing smoke from entering during a fire event. The design helps ensure safe access for emergency personnel and assists the elevator system in remaining operational under smoke conditions, creating a refuge for occupants who may be trapped inside.

The other choices describe different types of systems that may also use pressurization but are not specific to elevator hoistways. An air curtain system typically creates a barrier of air to isolate different environments within a building, while a building smoke control system generally focuses on managing smoke and heat within a larger structure, not confined to elevator shafts. Lastly, a positive pressure system broadly describes any system that maintains air pressure and can apply to many areas within a building, but does not specifically refer to the elevator hoistway application.