NFPA 80 (Standard for Fire Doors and Other Opening Protectives) and NFPA 101 (Life Safety Code) both require that fire doors in a means of egress must be self-closing and equipped with a positive-latching device. This ensures that the door will automatically return to the closed position and latch securely to prevent fire and smoke from spreading through the egress path.

A: Doors can be held open magnetically only when connected to the fire alarm system, but the essential code requirement is positive latching.

B: Materials and vision panels are not universal requirements.

D: Smoke-tight doors are required in smoke barriers, not all egress fire doors.