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

Resolution:

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

F and FN-Series frame:
- 4' 0" X 10' 0" single door opening
- 8' 0" X 10' 0” double door opening
MU-Series frame:
- 4' 0" X 9' 0" single door opening
- 8' 0" X 9' 0” double door opening
FE and DE-Series Double Egress frame:
- 8' 0" X 10' 0" double door opening
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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