making it suitable for hot water and low-pressure steam applications where compatible

this unit delivers a consistent 2950 RPM to ensure optimal drafting and proper combustion venting

Always verify the motor plate RPM and voltage against the cabinet data plate

This valve is designed for 24 Vac standing pilot heating appliances

eliminating guesswork on capacitor sizing

Siemens Building Technology GRD121.1U Actuator 321142-301 making it suitable for hotThe Siemens GRD121. 1U is a high torque 24V fire and smoke damper actuator engineered for precise 2 position control in critical life safety systems. As a veteran technician knows, reliability in smoke containment is non negotiable; this OpenAir electronic actuator delivers 30 lb in of torque to ensure positive closure against high velocity airflow. Operating on 24 VAC DC, the GRD121. 1U features a robust spring return fail safe mechanism that