Electronic Fan Timer with 30 fixed heat fan on, adjustable heat fan off, fixed 4 sec cool fan on and 100 sec cool fan off Stands alone. Integrate control of all combustion blower and circulating fan operations in a gas warm air appliance when you use the Honeywell ST9120U universal fan timer board. The unit creates a central wiring point for the electrical components of the furnace to help save you time. And while you?re saving time, you?ll also enjoy saving space on your truck, because the universal application capabilities of the ST9120U let it replace more than 25 other models. So you can meet all of your fan timer needs with just one model. On the surface, the job of the ST9120U is very simple: monitor temperature demands and run the fan as needed. But the ST9120U also handles all the little complexities of the job, And best of all, it?s ready to work in just about every situation, replacing more than 25 other models.

Brief: Furnace Fan Timer - ST9120U1003