Zonefirst SPRD-18 Damper Els PW 17895 ensuring reliable boiler safety control

ensuring reliable boiler safety control and system longevity without frequent recalibration

High Amperage Capacity: The 21A SPDT switch handles demanding inductive and motor loads

Constructed for demanding environments

" allowing technicians to isolate the problem quickly

Zonefirst SPRD-18 Damper Els PW 17895 ensuring reliable boiler safety controlThe 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