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Legend: Explanations & Illustrations Rationale Note Revision history Print

9.4 PURPOSE GROUP IV OCCUPANCY

9.4.1 General

a. Means of escape

(1) Aboveground office floors 

One exit staircase is permitted to serve an aboveground office floor
provided:

(a) the habitable height of the floor does not exceed 15m; 

(b) the floor does not be located above 4th storey; and 

E

(c) the AFA of the floor does not exceed 200m².

(2) Underground office floors

One exit staircase is permitted to serve an office basement provided:

(a) the building is of non-combustible construction;

(b) the depth of basement storey does not exceed 9m below the average ground level;

(c) compartment below ground does not comprise more than one storey; and

(d) the AFA of each basement storey, including service ducts, lift shafts, toilets, staircase, etc., does not exceed 200m2.

b. Structural fire precautions

(Not in use)