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The Lennox 17Y57 is a genuine OEM Single Core Energy Recovery Ventilator featuring a top port damper defrost mechanism, built to transfer both heat and moisture between incoming and outgoing air streams for balanced humidity and improved indoor air quality year-round. Failure symptoms include reduced fresh air delivery, humidity imbalances, or frost-related shutdowns during cold weather operation. This direct OEM replacement is compatible with applicable Lennox ERV systems, ensuring a precise fit and full restoration of energy recovery performance.