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Bard part 9044-222 is an OEM exhaust blower used in Bard wall mounted HVAC ventilation systems to move relief air out of the cabinet when the unit is configured with an exhaust capable fresh air damper or economizer package. Replacing a weak or failed exhaust blower helps restore proper building pressure control and keeps outdoor air ventilation operating as designed, which can reduce nuisance trips and comfort complaints tied to restricted airflow. Because exhaust blower fit and electrical ratings must match the specific ventilation option and unit series, confirm compatibility by checking your Bard model and serial number against the correct parts list or service manual before ordering.