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The Lennox 17Y64 is a genuine OEM Single Core Heat Recovery Ventilator featuring a top port damper defrost design, engineered to maintain efficient fresh air exchange even in cold climates by preventing frost buildup on the core. Signs of a failing unit include reduced ventilation performance, frost accumulation, or poor heat transfer between air streams. This is a direct OEM replacement compatible with applicable Lennox HRV systems, delivering a factory-spec fit for reliable, long-term operation.