July 5, 1999


Energy efficient homes are inherently airtight and require ventilation for acceptable indoor air quality. Of all the options currently available, the low cost and low maintenance central fan-integrated ventilation approach is the most acceptable to large production builders and manufactured home producers. This is a resource and energy efficiency strategy that utilizes the existing air ducts and the normal cycling of the fan, in response to demand from the thermostat, to distribute ventilation air and conditioned air at the same time. The patented AirCycler™ control can be used to automatically operate the fan if the fan has been inactive for a period of time, and to control a motorized outside air damper to limit the intake of ventilation air independent of fan operation.