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This UL 555S rated actuator includes a built-in mechanical end stop and is commonly utilized in multi-zone air handling units and pressurized stairwell systems to maintain architectural structural integrity during thermal events
the HC39AE230 is the professional choice for HVAC contractors looking to restore factory-spec airflow and system pressure HVAC motor replacement installations
preventing high-to-low side pressure equalization and improving startup efficiency
mitigating the risk of hazardous flue gas accumulation
provided the valve body is rated for steam and the ambient temperatures do not exceed the Class F insulation limits
Lochinvar & A.O. Smith 100191120 Ignitor 319825-402 This UL 555S rated actuatorThe Lochinvar & A. O. Smith 100191120 Ignitor is a critical OEM spark ignitor assembly engineered for high efficiency commercial gas fired water heaters and boilers. Designed specifically for compatibility with the A. O. Smith Cyclone Mxi (BTH, SUF, and HCG Series 200 201), this commercial water heater ignitor ensures precise, reliable spark generation for consistent burner ignition. This assembly features high grade ceramic insulation and a durable