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Use of fire doors in buildings -
General requirement of fire doors in individual  occupancies
3.4.5.6 - Vertical Opening in between floors
a) Shall have a clear opening height of 2100mm if it is in the exit pathway (means of egress)
b) Shall have minimum 120minutes fire rated door
3.4.6.3 - Substations / transformers
a) Air-conditioned MV panel room to be provided in basement or ground floor. b) It should be provided with fire rated walls and doors of minimum 120minutes.