What is the maximum size of a UL fire rated three (3) sided frame?

Fire Rated three (3) frames are available in the following maximum door opening sizes:

  1. F and FN-Series frame:
    • 4' 0" X 10' 0" single door opening
    • 8' 0" X 10' 0” double door opening
  2. MU-Series frame:
    • 4' 0" X 9' 0" single door opening
    • 8' 0" X 9' 0” double door opening
  3. FE and DE-Series Double Egress frame:
    • 8' 0" X 10' 0" double door opening
  4. DW and K-Series frame:
    • 4' 0" X 9' 0" single door opening
    • 8' 0" X 9' 0” double door opening


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