What are "UL Functions"?
Underwriters Laboratory (UL) is a global independent safety science company offering expertise across five key strategic businesses: Product Safety, Environment, Life & Health, University and Verification Services. They help ensure manufacturers produce products according to industry specifications.
The step in the installation instructions that refers to "UL Functions" is for a UL fire rated lock, which indicated by the suffix CF in the model number (example: F51A CF ACC 505).
If you do not have a UL fire rated lock, then you can proceed to the next step.
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