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Bard 910-1222 is an OEM filter switch assembly used to monitor air filter condition and help protect Bard wall-mount and packaged HVAC equipment from restricted airflow. When the filter loads up, this switch is designed to signal the control circuit so the unit can indicate a service condition or help prevent performance issues tied to low airflow. If you are troubleshooting nuisance filter alarms, intermittent operation, or a filter-related fault after verifying the filter and airflow path, replacing the Bard 910-1222 filter switch assembly is a common, direct-fit repair that restores proper filter sensing and reliable system operation.