Fan Snap Switch for Harman Gas and Wood/Coal Stoves. This is a 3/4", 110 degree snap disc. Works with the following Harman models:

Gas: Clarity 929 B-Vent, Clarity 929 DV, Clarity 828i, Shadowlight XL

Wood/Coal: Oakleaf, TL2.0, TL2.6 and more

Compatible with Harman Part # 3-20-408412