What I am wondering is whether I can direct wire it to the furnace to have it come on only when heating or cooling. I leave the blower running all the time to circulate the air in the house so I do not want the duct fan running when the heat / AC is not running.
depending on the connections to your supply fan you should tap off that connection,either off the terminal block in the fan section or in the control area where the fan wires come in.keep in mind that your AC runs one fan speed,and the HEAT the slower motor speeds
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