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The Bard 900-399-001 exhaust blower assembly is an OEM replacement fan package used to move combustion or ventilation air out of compatible Bard HVAC equipment, helping the unit maintain proper draft and safe, consistent operation during heating cycles. As a complete assembly, it is intended to restore correct airflow when an existing exhaust blower becomes noisy, weak, or unreliable, and it is built to fit and perform to Bard specifications for the equipment it was designed for. To avoid mismatches, confirm the part number 900-399-001 against your unit model and serial data or the Bard parts list before ordering.