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CHOOSING A Whole-House Ventilation SYSTEM Increasingly, because of either code changes or customer demand, builders are having to take a closer look at whether the new, tight houses they build have adequate ventilation. Many builders would like to provide something better than just a few bath exhaust fans but aren't sure how to design a simple ventilation system that is reasonably priced and meets the needs of the homeowner. Most whole-house ventilation systems rely on either exhaust fans or the fans in forced-air heating and airconditioning systems, because these fans are cheap, ubiquitous, and familiar to builders and homeowners. Yet just because these fans can be adapted for whole-house ventilation doesn't mean they do the job well. In many areas of the country, supply