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Use of fire doors in buildings -
General requirement of fire doors in individual  occupancies
3.4.5.1 - Openings in fire resistance walls & floors
a)  It should limit spread of fire
b) Maintain the fire rating of the structural opening. Ex. 120min wall 
3.4.5.2 - Size of the doorway or opening in a fire resistant wall 
a) For type 1 & 3 construction it should not be more than 5.6 mt.sq, with the maximum 
height/ width of 2.75 mt. (Approx.