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The Bard 8620-206 is an OEM CH and CC100 pressure switch kit used on select Bard wall mounted units to verify proper airflow or draft conditions so the system can operate safely and consistently. This switch monitors pressure in the control circuit and helps prevent nuisance shutdowns and unsafe operation by allowing the unit to run only when the correct pressure is proven. It is a direct fit Bard replacement kit intended to restore original safety and control performance, making it a solid choice when troubleshooting pressure switch faults or intermittent lockouts in compatible CH and CC100 equipment.