Labeled Fire-Rated wood or steel doors play a critical role in keeping people safe and help minimize property damage during a fire. Metal labeled fire doors control the spread of fire and smoke for up to 3 hours, wood for 90 minutes. Add glass for sightline which allows a building to be evacuated safely. PYRAN® Platinum fire-rated glass-ceramics are certified by Underwriters Laboratories for fire-protection ratings up to 90 minutes.