Escape Route Ductwork Systems
Escape route ducts are any duct crossing an escape corridor. In accordance with (BS9999:2017 clause 220.127.116.11), escape route ducts must be fire rated.
The pressurised air supply duct requires integrity and insulation for fire outside Type A ( shown ) for the same period of time as the compartment through which it passes.
The ductwork in the final compartment (Escape Lobby) ( shown ) will require integrity rating for the same period of time as the compartment through which they pass.
Both the normal ventilation supply duct and extract duct follow a route from the riser shaft through the office using the dampers and galvanised sheet steel duct - method 1 of BS 9999:2007 ( shown ).
Ducts that cross in the escape corridor ( shown ) must be fire rated and will require integrity and insulation for the same period of time as the compartment through which they pass.
The escape route duct will also require at least one fire damper either side of the escape corridor.
All fire rated ductwork and penetration seals must be tested to BS EN 1366-1 and classified in accordance with BS EN 13501-3 by a recognised NAMAS/UKAS accredited laboratory.
Note: Final approval must always be obtained by the local building control officer/fire department prior to commencement of construction.