Q: We have a mechanical room door that is ¾-hour rated. The mechanical room is a 10 foot x 10 foot room with two electrical panels and a small gas fired heating unit. The metal door frame does not have a rating label on it. Does the frame need to be ¾-hour rated?
A: Anytime you have a fire-rated door assembly, the frame needs to be labeled as a fire-rated frame. Door frames typically (but not always) just have a label that says it is a fire-rated frame without any time associated with it. Those frames that are just labeled as being fire-rated are good for 3-hours, according to information that I seen on the manufacturer’s website. After 3-hours, then the frame needs to be labeled with the specific fire-rating needed.
The room that you are describing is required to be classified as a hazardous room since there is a fuel-fired heating appliance in the room. A hazardous room in a healthcare occupancy under existing conditions is required to have 1-hour fire rated walls with a ¾-hour fire-rated self-closing and positively latching door if the room is not sprinklered. However if the existing room is protected with sprinklers then the Life Safety Code allows you to have smoke resistant walls with a non-rated smoke resistant self-closing positively latching door.
If the hazardous room qualifies as new construction (or renovation), then the room must be constructed with 1-hour fire rated walls with a ¾-hour fire-rated self-closing positively latching door and the room must be protected with automatic sprinklers.
Even if the fire rated door that you refer to is not required, you must maintain it as such, which means the frame must also be labeled as being a fire-rated frame.