It is very important to know if a door is fire-rated before making any modifications to the door. Certain products and door modifications compromise the door’s ability to keep fire from passing through the opening.
If you install non-fire-rated hardware on a fire-rated door, the entire door opening will lose its fire rating. For example, non-fire-rated locks are not built to withstand the heat and/or pressure created by a fire and will likely fail, allowing the door to be blown open and fire to quickly pass through.