Life safety Use of fire doors in buildings - 4.8 Hazardous Areas, Gaseous, Oil storage Yard, etc.. 1. Rooms containing high pressure boilers, refrigerating machinery, transformers, or other service equipment's shall be away form staircase and segregated with 120min fire rating wall. 4.10 Fire officers 1. Minimum three years experience shall be appointed and will be available in the premises for large educational complexes, business buildings with height 30mt and above, residential buildings with height 60mt and above, institutional buildings 15mt and above. 2.