9.29.9 Fire Escape Chutes / controlled Lowering Device for evacuation

i) a) High rise building having height more than 70 m. shall necessarily be provided with fire escape chute shaft/s for every wing adjacent to staircase.

b) Walls of the shaft shall have 4 hours' fire resistance.

c) One side of the shaft shall be at external face of the building with proper ventilation.

d) The dimension of the shaft shall not be less than 2.5 m. x 1.5 m.

e) The access to the fire escape chute's shaft shall be made at every floor level from lobby area or from staircase mid-landing with self-closing door having fire resistance of at least one hour.

f) The fire chute shall be of staggered type with landing of each section at the vertical height of not more than 21.0 m. Alternatively,

ii) High rise building having height more than 70.0 m., shall be provided with fire tower at landing / mid-landing level with smoke check lobby with fireman lift being integral part of the fire escape staircase or fire evacuation lift (Hydro pneumatic / electrically operated) on the external face of the building having opening within the fire escape staircase at landing / mid-landing level with smoke check lobby as approved by Chief Fire Officer shall be

provided.

Note - Both the smoke check lobby with evacuation lift shall have positive level difference of minimum 75 mm. with respect to staircase landing or mid-landing level to avoid ingress of water in fireman lift shaft.