this HVAC pressure switch protects the equipment from operating under hazardous low-pressure conditions that could lead to coil icing or motor burnout

or moisture leading to pitting and corrosion

Ensure your HVAC controller is sending a compatible 24V signal

Corrosion-Resistant Steel: Galvanized finish prevents oxidation in high-humidity return air environments

Resideo MARD-8 Damper 319852-301 this HVAC pressure switch protectsThe Resideo MARD 8 is a heavy duty 8 inch modulating automatic round damper designed for high performance bypass and zone control in commercial and residential HVAC systems. Built with a 22 gauge galvanized steel shell, this single blade damper features a male crimped and female uncrimped end for seamless integration with rigid or flexible ductwork. A primary application for this 3 wire motorized damper is managing bypass air in systems larger than