April 15, 1999


A single-story, single-family, 1350 sq. ft. house located in Las Vegas, NV was outfitted with two separate ventilation systems. The systems were independent of each other, and were operated at different times to evaluate the relative difference in air change rate and distribution of ventilation air induced by their operation. Energy efficient homes inherently have low air leakage rates and, therefore, require mechanical ventilation for acceptable indoor air quality.