OCFA Building Construction Practice Test

Protected, fire-resistance-rated exit stairs provide safe vertical egress and smoke protection. These stairs are enclosed by fire-rated walls and doors and, in many designs, are pressurized to keep smoke out, ensuring occupants can descend safely even while fire and smoke are present on other floors. A mechanical shaft isn’t designed for evacuation and can become a conduit for smoke if not perfectly contained. A smoke vent helps remove smoke but doesn’t guarantee a tenable escape path. A water main is unrelated to occupant egress or smoke control.