Digital watches digital

Can a thermostat be used to control the furnace fan for an outdoor wood boiler? - outdoor thermostat

I replaced a Thermostat 2 son to my old gas furnace with a digital controller. Which cables are used with the fan switch? its boundaries into the oven thermostat and used boh? What color thread for what kind of terminal? It is also possible to operate an auxiliary thermostat in the oven, regardless of the fan experience, to be distributed heat from a wood boiler installed outside?