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San Ramon LogoEmergency Escape and Rescue Windows

 

Sample of Height & Width Measuring of a Window

Because so many fire deaths occur when occupants of residential buildings are asleep at the time of a fire, the C.B.C. requires that:

  • basements in dwelling units; and,
  • every sleeping room below the fourth story shall:
    have at least one operable window or door approved for emergency egress and rescue. This exit shall open directly into a public street, public alley, yard or exit court. The units shall be operable from the inside to provide a full clear opening without the use of separate tools or knowledge.

Extensive testing by building and fire departments established the minimum size window requirements found in section 310.4:

  • The net clear openable area shall be no less than 5.7 square feet.
  • In addition to the above requirement, the net clear openable height dimension shall be a minimum of 24 inches. The net clear openable width dimension shall be a minimum of 20 inches. (Note: Using both minimum figures will NOT obtain the required 5.7 square feet).
  • The finished sill height shall not be more than 44 inches above the floor.

Minimum Width/Height Requirements
for Emergency Escape and Rescue Windows

Width

20

20.5

21

21.5

22

22.5

23

23.5

24

24.5

25

25.5

26

26.5

27

Height

41

40

39.1

38.2

37.3

36.5

35.7

34.9

34.2

33.5

32.8

32.2

31.6

31

30.4

Width

27.5

28

28.5

29

29.5

30

30.5

31

31.5

32

32.5

33

33.5

34

34.2

Height

29.8

29.3

28.8

28.3

27.8

27.4

26.9

26.5

26.1

25.7

25.3

24.9

24.5

24.1

24

 

 

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