This limit switch is typically mounted on the furnace plenum or blower housing

it is keyed and rated specifically for the amperage required by the blower motor

By logging fault history into its onboard EEPROM memory

it handles varying head pressures effectively

ensuring precise calibration and system integrity

Auburn FI21500 Spark Plug 320788-702 This limit switch is typicallyThe Auburn FI21500 Spark Plug is a high performance industrial ignition electrode designed for demanding heating and combustion systems. This OEM spark plug, which is technically identical to the BM6043 model, provides the consistent ignition performance required to maintain peak combustion efficiency in commercial furnaces and boilers. Engineered to withstand high thermal environments, the Auburn FI21500 ensures reliable starts and reduces downtime