4T110F Thermodisc – 110°F Flush Mount Low Limit Fan Switch for Wood, Pellet & Corn StovesMaintain safe and efficient operation of your stove with the 4T110F Thermodisc. This flush-mount, low-limit snap disc switch allows power to flow to your blower only when your stove reaches optimal heating temperature—cutting off power when the stove cools down to prevent cold air circulation. Ideal for wood, pellet, and corn stoves, it also serves as a direct replacement for the discontinued 4T120F.Works well with St. Croix and Apache StovesKey Features:Proof of Fire Activation – Ensures the blower only runs when your stove is actively producing heatLow Limit Control – Closes at 110°F to start the blower, opens at 90°F to stop the fanFlush Mount Design – Compact, secure fit for easy integrationVersatile Compatibility – Generic control used across multiple stove brands and modelsReplaces OEM Parts – Equivalent to 80P20038-R, NBK 20159, F110-20F, and moreSpecifications:SKU: 4T110FPart Numbers: 80P20038-R, NBK 20159, F110-20F (equivalent)Switch Type: Normally open snap discClose Temperature: 110°FOpen Temperature: 90°F (20°F differential)Mounting Style: Flush mountApplication: Low-limit proof of fire / combustion blower activation switchCompatible Stove Models:ApacheSt. Croix Pellet & Corn Stoves, including:Afton BayAshby-MF, Ashby-PAuburnEclipseElement-MF, Element-PGreenfieldHastingsLancasterLincoln SCR (Serial 0–300)Lincoln SCS (Serial 301+)PepinPrescott EX, EXP, EXLRevolutionSCF-050York InsertFitment Note: This switch is also widely used as a generic control on many other wood and pellet stove systems. Always check your stove’s manual or existing switch part numbers for proper compatibility.Pairs well with: Apache Parts and St. Croix PartsPrevent unnecessary fan operation and keep your stove running efficiently with the 4T110F Thermodisc.








