York S1-2790-3171 Fan Switch 321894-706 25" NPT connection and optimized

25" NPT connection and optimized internal geometry provide superior flow rates compared to balanced-plug designs

Designed with 70% fewer moving parts than reciprocating models

000 hours under standard conditions

contractor-grade installations during service calls

this assembly includes the 61145 pilot and internal electrodes

York S1-2790-3171 Fan Switch 321894-706 25" NPT connection and optimizedThe York S1 2790 3171 Fan Switch is an essential OEM component designed for precise fan and limit control in residential heating systems. As an industrial grade furnace fan limit switch replacement, this part ensures optimal airflow by managing the blower activation cycle and providing critical high limit safety protection. This switch is the direct manufacturer specified equivalent for the F120 35F fan switch, engineered to maintain system integrity