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The Lennox Y0628 Healthy Climate Pureair Commercial Door Kit (101621-02) is a genuine OEM replacement component designed for use with Lennox PCO G2 air purification systems in 16-28 commercial applications. A damaged or improperly sealed door can compromise air filtration efficiency, allowing unfiltered air to bypass the purification system and reducing indoor air quality. This OEM Lennox kit restores a secure, airtight fit to ensure your Pureair system operates at peak performance and maintains proper airflow integrity.