Zonefirst SPRD-18 Damper Els PW 17895 allowing you to define the

allowing you to define the temperature swing before the relay toggles

flush-mount installation

this crankcase pressure regulating valve protects the compressor motor against overload during startup—especially after long standstill periods or defrost cycles when evaporator pressure is high

the NEMA 4X rating indicates the housing is designed for protection against hose-directed water and corrosion

Zonefirst SPRD-18 Damper Els PW 17895 allowing you to define theThe 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