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Definition clarification for ventilation ducts
4.4(i)NI-wide·Amendments Booklet AMD 9 2025 (Booklets E R)
Ventilation ducts
ventilationAmendment (57): Cavity Plenum Requirements - Page 111
(57)NI-wide·Amendments Booklet AMD 9 2025 (Booklets E R)
Page 111 Delete paragraph 4.41(b)(vii) and substitute – "(vii) where the cavity is used as a plenum – the relevant recommendations of BS 9999 in relation to recirculating air distribution systems are
fire-safetyventilationSmoke control for firefighting shafts
Diagram 6.0, Note 2NI-wide·Amendments Booklet AMD 9 2025 (Booklets E R)
Smoke control should be provided in accordance with BS 9999 or, where the firefighting shaft only serves flats, the provisions for smoke control given in paragraph 2.34A may be followed instead.
fire-safetyventilationflats