The HVI-certified HRV series offers up to 92% heat recovery, according to the manufacturer, with cfm rates from 123 to 247 to accommodate various residential conditions and requirements. The units feature a 22/24-gauge galvanized steel cabinet that is fully insulated with 1-inch high-density polystyrene foam to help prevent condensation; other features include washable, electrostatic panel-type air filters and factory-balanced EBM motors with permanently lubricated sealed motor bearings. The aluminum core is configured for efficient cross-flow ventilation and to withstand extreme temperatures. An optional dehumidistat and air-quality sensor are available. 877.254.4729. www.goodmanmfg.com.