UL Expands Door Hourly Ratings

UL recently issued a letter regarding a Door Hourly Rating Expansion which announced an option to conduct a 2-hour fire test where they currently test for 1-1/2 or 3 hours.

Here is an excerpt:

“As a part of the certification for swinging type fire doors, an hourly rating is attributed to each product based on the period of fire exposure. Currently, such hourly ratings include 4, 3, 1-1/2, 1, 3/4, 1/2, and 1/3 hours. In an effort to align UL’s certification offering with the building codes and customer requests, UL is prepared to include additional hourly ratings for swinging type fire doors.”

The letter also included an excerpt from the 2015 International Building Code (IBC) and the 2005 National Building Code of Canada (NBCC).  Both organizations categorize a minimum rating in hours depending upon the partition used to install the assembly.

This expansion by UL would better align with the new NBCC ratings.

UL Compliance - Door Hourly Rating Expansion_IBC

More information can be found at the International Code Council.

Will this expansion by UL affect Eggers’ fire labels?

Because the codes (rather than the test method) determine the required fire endurance, this will not affect our fire ratings or applications.

Will Eggers be conducting any additional testing?

Not at this time. As always, subscribe to the Eggers Blog to be notified of any changes or new information as it becomes available.