This is the Energy Recovery Ventilation unit, or ERV. These systems act as an air exchanger, which have been commonplace in commercial applications for years. Now that homes are being built so airtight, fresh air and ventilation is becoming more critical. Since our home is going to be all brick, our HVAC subcontractor highly recommended this option. This system will also replace the functionality of the bathroom ventilation fans, affectionately referred to as “fart fans” by our HVAC subcontractor.