Revit Unprotected Opening and Limiting Distance Calculations 

This video describes a method for creating special Limiting Distance Façade Elevations with tags and a schedule to demonstrate compliance with Building Code requirements.
1:30 Overview of steps
3:15 Creating Filled Regions for exposing building faces/fire compartments & unprotected openings
4:20 Creating custom area tags for the filled regions
7:55 Tagging the filled regions
9:20 Creating shared parameters
12:25 Creating project parameters from the shared parameters
13:45 Populating the project parameter fields with data for the schedule
15:45 Creating the schedule
17:20 Creating the percentage calculation parameter
17:50 the percentage calculation formula
19:00 Refining the schedule
22:15 Final result