Fire-rated doors are required at fire barriers, egress points, stairwells, and between garages and homes to slow fire and smoke spread. Their use is mandated by building codes like NFPA 80. SSelection depends on fire rating (20–180 minutes), door location, and occupancy: residential garages or corridors typically need 20-minute doors; schools and some multi-family units, 45 minutes; commercial or mid-risk industrial areas, 60 minutes; stairwells and high-risk zones, 90 minutes; and boiler rooms or flammable storage, 180 minutes. The door rating should match the wall’s fire-resistance rating and comply with local codes.