Air leakage data for the design of elevator and stair shaft pressurization system.

Describes research project to find air leakage values of walls of elevator and stair shafts in order to use these values in the design of pressurization systems. Describes method of test and gives results. Concludes that leakage rates for walls of elevator shafts constructed of masonary units are higher than those of cast-in-place concrete. Variations in the leakage of stair shafts could not be related to the type of wall construction but probably depended on the workmanship in sealing crack openings. Finds that internal flow resistance of a stairshaft is substantial and must be taken into account in designing a stair shaft pressurization system.