LIMITING DISTANCE AND AREA OF UNPROTECTED OPENINGS CALCULATOR

Table 3.2.3.1.-B(-C,-D,-E) - Unprotected Opening Limits for a Building or Fire Compartment that is not Sprinklered Throughout

PROJECT NAME: WALL ELEVATION NAME:
Exposing Building Face Allowable Area %
Maximum Area - m² "Ratio (L/H or H/L)" Limiting Distance - m
2.000 2.500
50 10 18
Less than 3:1
60 Less than 3:1 10 16
Max opening size if building not sprinklered (m²) and LD is less than 2m

Last row calcs or code exact maximum area

Maximum Area - m² "Ratio (L/H or H/L)" Limiting Distance - m
2.000 2.500
33 45
Max opening size if building not sprinklered (m²) and LD is less than 2m
  • Building Code numbers from "Max, Area, m²" Column
  • Building Code numbers from "Limiting Distance" row
  • Building Code table numbers surrounding the extrapolated number in correct "ratio" row
  • Project numbers
  • Extrapolated allowable area