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Technical Booklet E Fire Safety·Page 109·4.24

Combined width of fire-door openings in compartment walls

The total width of openings for fire doors in a compartment wall must not exceed 25% of the wall's length.

fire-safetycompartmentation
The combined width of openings for fire doors in a compartment wall should be not more than 25% of the length of the compartment wall.

Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet E - Fire Safety.pdf