Infrasonic measurement of building air leakage-a progress report.

Describes infrasonic method of measuring the air leakage of a house or apartment. Describes apparatus, consisting of a motor driven source of known output a sensitive pressure pickup and anelectronic signal processor. A low frequency (about one cycle per second) alternating air flow of known magnitude is applied to the interior of the building, and the alternating component of inside pressure that results is measured. The pressure response is a function of the type and size of leakage paths. Describes measurements made on three interior rooms and gives sample results. Concludes that the accuracy of the present system is rather low and that interpretation is difficult but that the system is easier to set up than a blower.