What does 'FM Approved' mean on a firestop product compared to 'UL Listed'?
-
A
Both designations indicate third-party testing and certification to fire standards, but FM (Factory Mutual) and UL (Underwriters Laboratories) are separate NRTLs with their own testing programs
-
B
FM Approved products are for industrial facilities only; UL Listed products are for commercial buildings only
-
C
FM Approved means the product passed a single test; UL Listed means annual re-testing is required
-
D
'FM Approved' applies to fire dampers; 'UL Listed' applies to sealants and mortars only