Canada Builds

Unprotected Openings

Study the following image and answer the questions below in terms of fire protection for the exposed building face.

Figure  1           Unprotected Openings

Read OBC sentences 3.2.3.1.(1), (2), (4), (5), (6), and (7) and article 3.2.3.2., and consider the drawing shown above in figure 3.
Calculate the area of unprotected openings that will be permitted in the south exposing building face. The known values are as follows:

  • The limiting distance is 4.0 m
  • Fire compartment ‘A’ is 4.0 m x 7.5 m at the exposing building face
  • Fire compartment ‘B’ is 8.0 m x 7.5 m at the exposing building face
  • The building is a group ‘D’ occupancy
  • The building is not sprinklered

Area of Exposed Building Face for ‘A’ = __________ m2

Area of Exposed Building Face for ‘B’ = __________ m2

Maximum unprotected opening area for wall face A =  ______ m

Maximum unprotected opening area for wall face A =  ______ m2