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The Lennox 17Y55 is a genuine OEM Single Core Energy Recovery Ventilator with a top port damper defrost design, engineered to simultaneously recover heat and transfer moisture between exhaust and supply air streams, reducing energy consumption while maintaining healthy indoor humidity levels. Common signs of failure include poor ventilation, humidity imbalances, excessive frost formation, or decreased system efficiency. As a direct OEM replacement for compatible Lennox ERV units, this part ensures factory-level performance and a seamless installation.