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Bard part S166-015 is an OEM fan venturi used in select Bard wall mounted HVAC equipment to properly funnel air through the fan opening, helping the fan move the designed airflow across the coil and cabinet. A worn, cracked, or missing venturi can contribute to reduced airflow, noise, and poor system performance, so replacing it with the correct Bard factory part helps restore normal operation and airflow characteristics. Match this part to your unit model and serial number using the Bard parts list to confirm exact fit before ordering.