The Aaon P51900 follows the standard 8-pin blade layout

This 96-inch replacement furnace gasket is constructed from high-density gas furnace insulation material that resists degradation from high-temperature cycles

How do I confirm if this SPDT limit switch is compatible with my York unit

As a two-pole (DPST) high limit with SPDT thermostat contacts

By maintaining a stable millivolt output

Lennox 84L00 Limit Switch The Aaon P51900 follows theThe Lennox 84L00 Limit Switch is a critical OEM replacement part designed for high precision thermal monitoring in residential and commercial furnaces. Engineered as a 130 160F AUTO limit switch, this SPST (Single Pole Single Throw) control features a 3 inch stilt insertion to provide accurate sensing within the heat exchanger airflow. This component is identical to part number 84L0001 and serves as a direct Lennox furnace high limit replacement,