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

Print | Sitemap
© TNB Doors