What size hole is acceptable in a fire label door?

• A. One inch
• B. Quarter inch
• C. None
• D. Half inch

Answer: (C)

Fire-labeled doors are designed to withstand fire for a specified period, and that protection relies on an uninterrupted barrier. Any hole in the door creates a path for heat, smoke, and flames to pass through, reducing or eliminating the rated performance. Because of that, no openings are permitted in a fire-rated door—the door must remain intact as tested. If a hole exists, the door no longer meets the labeling and should be repaired or replaced to restore the rating. So the acceptable size of a hole is none.