Size:Magnetic Thermostat Magnetic Thermostat Switch for Fireplace Blower Fan /Kit use, no screws and nuts needed. Drablow quality replacement parts.Thermostat switch activate approximately at 120F (50C), shut offapproximately at 90F (32C) Upgraded part used: Stainless Steel 430 + Highheat resistant ceramic (white part) thermo sensor. 2-year limit warranty.Reminding: Blower will not Start until thermostat is heated to approximately120 F Thank you for choosing Durablow Fireplace Replacement Parts!Features:Magnetic Thermostat Switch for Fireplace Blower Fan / Kit use, no no screwsand nuts needed. Thermostat switch activate approximately at 120F (50C),shut off approximately at 90F (32C) Reminding: Blower will not Start untilthermostat is heated to approximately 120 F ty.