Zonefirst SPRD-18 Damper 30067439-890 For high-stakes commercial environments

For high-stakes commercial environments

this specific model is rated for 120V/50-60Hz

is a rugged

This HVAC sequencer utilizes factory-calibrated time delays to prevent electrical overloads and nuisance tripping by staggering the inrush current of high-wattage heating elements

For service calls requiring a robust ignition source

Zonefirst SPRD-18 Damper 30067439-890 For high-stakes commercial environmentsThe 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