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Technical Booklet E Fire Safety·Page 116·Table 4.6, Note 5

Cavity barriers around window and door openings

Cavity barriers provided around window or door openings may be formed by the window or door frames themselves.

fire-safetyglazing
Cavity barriers provided around window or door openings may be formed by window or door frames (see paragraph 4.38).

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