Water vapor mass balance method for determining air infiltration rates in houses.

A water vapour mass balance technique that includes the use of common humidity-control equipment can be used to determine average air infiltration rates in buildings. Only measurements of the humidity inside and outside the home, the mass of vapour exchanged by a humidifier/dehumidifier, and the volume of interior air space are needed. This method gives results that compare favourably with those obtained with standard methods using tracer gas.