Zonefirst SPRD-18 Damper 30067439-890 it is designed to seal

it is designed to seal dry on clean

allowing for reliable temperature control and airflow management across complex heating and cooling loops

ensuring no-hassle retrofits for maintenance contractors

consider the Belimo B219B valve

or diaphragm fatigue in internally piloted 2-way solenoid valves

Zonefirst SPRD-18 Damper 30067439-890 it is designed to sealThe Zonefirst SPRD 18 is a professional grade 18 inch round barometric bypass damper engineered to maintain critical static pressure relief in multi zone HVAC applications. As zone dampers close, this single blade mechanical component automatically responds to rising pressure, diverting excess airflow to the return plenum or a dump zone to prevent coil icing and blower motor strain. Unlike motorized alternatives, the SPRD 18 utilizes a counter