Bard 8406-074 - SPDT Pressure Switch 0.45 in. W.C.

Bard part 8406-074 is an OEM SPDT air pressure switch rated at 0.45 inches water column, used as a safety and proving switch in Bard HVAC equipment to confirm proper airflow or draft conditions before allowing the system to operate. When the correct pressure is present, this switch changes state to signal the control circuit, helping prevent operation under restricted airflow or improper venting conditions. Because pressure switches are application specific, match the 0.45 in. W.C. rating and SPDT switching style to your unit’s parts list and verify the tubing and electrical connections before installation to ensure correct fit and reliable operation.

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