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Bard part number 5070-021 is an OEM Heat Recovery Cassette sized for 5 ton equipment in the 1 meter configuration, built to restore proper heat transfer between the exhaust and incoming airstreams on compatible Bard ventilation and heat recovery assemblies. When a cassette is worn, binding, or damaged, the system can lose recovery effectiveness and may show higher load, poor ventilation performance, or airflow related complaints. Replacing the cassette with the correct Bard OEM assembly helps maintain designed ventilation operation and overall unit efficiency, and it is the right choice when you need dependable fit and function without modifying the original equipment.