this valve is fixed-orifice calibrated specifically for 1

For ease of installation in tight control cabinets

Automatic Reset Thermal Protector: Guards the internal windings against overheating due to restricted airflow or capacitor failure

this component ensures a direct physical and electrical drop-in fit

Whether you are performing a repair or a system upgrade

Siemens Building Technology QFA3212.EWSN Sensor 328140-751 this valve is fixed-orifice calibratedThe Siemens QFA3212. EWSN is a high precision room humidity and temperature sensor designed for demanding commercial HVAC and building automation systems. Built for seamless integration with Siemens Terminal Equipment Controllers (TECs) and APOGEE systems, this unit provides critical environmental feedback to ensure optimal indoor air quality. It serves as a direct professional upgrade and replacement for the QFA3212. EWNN, maintaining the same