Hello I am currently putting in a indoor wood boiler. It will be used with a Hot air furnace. I currently have everthing plumbed with no problems. I have a heat exchanger that is in the ductwork. My question is how do I get the fan of my Bryant plus 90 gas furnace to come on & off with a separate thermostat? Can I just wire the second thermostat to the G & R terminals? I want the gas furnace to still take over the heating requirments if the fire goes out.