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The Bard 5070-054 drive belt is an OEM replacement belt used on select Bard wall-mounted HVAC equipment to transmit power and keep the blower drive operating at the correct speed for steady airflow. With a specified length of 48.875 inches, this belt is a common service item when you see belt glazing, cracking, slippage, or squeal, and replacing it helps restore proper ventilation and overall unit performance. Verify belt length and cross section against your Bard model and serial information before ordering to ensure correct fit.