Bard 8406-074BX - SPDT Pressure Switch 0.45 in. WC

Bard 8406-074BX is an OEM SPDT air pressure switch set for 0.45 inch water column, used as a safety and proving device in Bard HVAC equipment to confirm proper airflow or draft before allowing the system to operate. When the correct pressure is present, the switch changes state to signal the control circuit, helping prevent nuisance lockouts and protecting key components during heating or ventilation operation. Because pressure switches are application-specific, verify the required setpoint and electrical connections against your Bard unit model and wiring diagram before ordering to ensure correct fit and reliable system sequencing.

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