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the 12A04 ball check device serves as a certified vent limiter for indoor use
55"wc SPST pressure switch is engineered to monitor the negative pressure generated by the inducer motor
this component serves as a critical safety limit
it is engineered for extreme reliability across a broad temperature range
Cleveland Controls DFS-221-199 Pressure Switch the 12A04 ball check deviceThe Cleveland Controls DFS 221 199 is a professional grade air pressure sensing switch engineered for high accuracy airflow proving in duct heaters, ovens, and gas fired combustion systems. This fixed setpoint pressure switch is factory calibrated to actuate on a pressure rise of 0. 05" WC ( 0. 02" WC), providing a reliable safety interlock for HVAC and energy management applications. Its compact, non adjustable design is particularly effective for