Residential ERVs plug into an outlet and do not need to be hardwired into a home's electrical The Broan AI series is the most advanced residential fresh air system on the market. This unit features their 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, and comfortable air without the need for specialized measurement tools or added install time. Features: MERV 8 filters are installed, capturing lint, dust, pollen, dust , debris and spores for air and comfort. Even more powerful filtration is available with an optional MERV 13 filter upgrade Powerful, reliable and quiet PMSM ECM fan motors provide up to 60% energy savings compared to other units on the market Developed on a compact, universal platform with several mounting options to save space and reduce install time With a selectable airflow speed range from 35-133 CFM, this AI Series model will meet the needs of a medium-large size home Unit setup, balancing and diagnostics are made easy with complete control using the integrated LCD screen providing real-time airflow measurements, automatic system balancing and simple diagnostic codes This product is equipped with top port configurations Product Technologies: VIRTUO™ Air Technology: Continuously monitors the changing indoor and outdoor conditions to provides fresh, filtered and healthy air throughout the home Specifications: CFM: 35, 133 Duct Size: 5" Round Height: 21-1/2" Width: 21" Depth: 16-3/10" Amperage: 1.36A Voltage: 120V Wattage: 163W