Broan Ai Series 150 Cfm Heat Recovery Ventilator (Hrv) A Healthy Home Starts With Fresh Air. The Broan Ai Series Is The Most Advanced Residential Fresh Air System On The Market. This Unit Features Our Virtuo Air Technology Which Is Specifically Designed To Provide Fresh Air In Any Season And In Any Installation Situation. Easy Installation Combined With Auto-Balancing Means Fresh. Filtered. Comfortable Air Without The Need For Specialized Measurement Tools Or Added Install Time.