p) cavity barriers (see Clauses 33

p) cavity barriers (see Clauses 33 and 34);q) fire-resisting ceilings (see Clauses 31 and 34);r) fire-protected air transfer grilles (see 33.4.8); ands) parts of external walls forming protected areas for space separation purposes (seeClause 36).32.2 Fire resistance of compartmentsThe fire resistance periods given in Ninth Schedule of Uniform Building By-Laws 1984 arebased upon the elements of structure surviving a burn-out.NOTE. The fire-resistance classification periods are not a measure of the actual time for which anelement will function in a real fire.For property protection purposes, the construction separating one compartment from anotheris usually expected to withstand the burn-out of the contents of the compartment. This appliesto the integrity, insulation, and if relevant the load-bearing functions of the separatingelements. The size and relationship of compartments should be based on the maximumacceptable loss, and the criticality of items or activities in the building. The risk managementstrategy may focus on contingency rather than physical forms of protection.A sprinkler system, suitably designed and installed for the hazard to be protected, can beexpected to prevent the rate of heat release from significantly exceeding that at the time ofsprinkler operation. In most instances it will assist in controlling the fire. The fire resistance ofthe compartment walls and floors can therefore be reduced in a sprinklered building orcompartment.32.3 Size of compartmentsCompartment sizes should be not more than the maximum sizes given in Fifth Schedule ofUniform Building By-Laws 1984 for the appropriate purpose group.