I have an open 3 story house w/ a wood stove on the main floor and want to distribute the warm air trapped in the upper vaulted ceiling via the return air duct thru the air handler while in the fan only mode. As my wood stove burn 24/7 6/7 mo. out of the year, I want to put a programmable timer on the "fan only" circuit of my thermostat/air handler. I want to be able to run the fan on a timed basis (10-15 min. per hr/ certain hours) and be able to shut it off w/ the "fan only" switch on the thermostat. Any ideas and/or help locating a supplier for a timer would be greatly appreciated.