Is this a motor with brushes, I would doubt it.

A motor without brushes (like a fan) should not cause any TV
interferecne at all. A motor with brushes (like a drill) will be very
difficult to prevent the interference.

Is this a gas or oil furnace. If it is oil, it may be the high voltage
ignitor and not the blower that is causing the interfrecne. This
may be easier to cure.



Mark