Fire-Rated
Doors and frames are rated and given a label after extensive testing by the Underwriters Laboratory. Rated doors must be self-closing and must have a positive latch.
| UL Label | Rating | Rating | Max Glass Area |
| A | 3 HR | 180 MIN | 100 square inches per leaf |
| B | 1 1/2 HR | 90 MIN | 100 square inches per leaf |
| C | 3/4 HR | 45 MIN | 1296 square inches per lite |
| D | 1 1/2 HR | 90 MIN | Refer to local codes |
| E | 3/4 HR | 45 MIN | Refer to local codes |
| 1/3 HR | 20 MIN | 1296 square inches per lite | |
| S | SMOKE | SMOKE |
UL Labels D and E are for exterior doors that are subject to fire hazards from the outside of the door.
To learn more on the safety of Fire Rated doors read the link below:
https://steeldoor.org/wp-content/uploads/2020/04/Fire20Rated20Doors20and20Frames20Overview-1.pdf
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