Product Covered:
Trussbilt 20-180 Minute Steel Sliding Fire Door Frame.
For Use With:
Maximum Sliding Door Size: 56-1/2" wide x 96" high
Maximum Clear Opening: 48" wide x 96" high
Per UL 10b (2009), NFPA 252 (2008), CAN4 S104 (1985), and ASTM E152-81a.