The infiltration data set covers December 1990 to October 1991 from Reference Unit #5 at the Alberta Home Heating Research Facility (AHHRF) with a total of 6063 hours of data. The facility is made up of six permanent test houses, five of which are built to residential wood frame construction standards with a sixth house of masonry construction. The six unoccupied test houses have been continuously monitored since 1980 for building envelope energy losses and ventilation rates.