Fantech VHR704R VHR Series Heat Recovery Ventilator w/ Fan Shutdown Defrost, 58 CFM 5" Top Ports (up to 1,400 Sq. Ft.) Powder coated 24-gauge galvanized steel cabinets Fully insulated with 1" aluminum foil-face high density foam (2) German manufactured motors with backward incline impellers Aluminum heat recovery core Top port design fits in tight spaces Super compact size Includes easy-mount wall bracket 3-speed ventilation Uses low voltage controls Automatic exhaust defrost allows units to always stay in ventilation mode Equipped w/ recirculation defrost feature 3' plug-in power cord (2) Electrostatic filters