furnace limit switches are calibrated to specific temperature setpoints

The Watts 0792040 is a high-performance 1 inch atmospheric vacuum breaker engineered for non-continuous pressure applications in potable water systems

Durable Construction: Made from high-grade materials to withstand extreme temperatures and mechanical wear

It only closes when the 208V solenoid coil receives power

high/low temperature limit functions

Greenheck CSP-A200 Inline Cabinet Fan 321894-709 furnace limit switches are calibratedThe Greenheck CSP A200 inline cabinet fan is a compact inline exhaust fan designed for continuous ventilation in commercial and light industrial HVAC systems. Built for ceiling or in line duct installation, this cabinet exhaust fan delivers reliable airflow performance in applications such as offices, restrooms, and general building exhaust. The CSP series is engineered for quiet operation with insulated housing, making it suitable for occupied spaces