I stand corrected. I was looking at the specs for my Trane XR80
furnace.According to the specs, at full load it uses 10.2 amps. This
includes the combustion motor (FLA rated at 1 amp), the hot surface
ignitor ( 2 amps), and the blower, gas valve, and other circuitry. The
blower is 1/3 HP, but I could not find the current rating on it, and I
do not have an amprobe to measure the current, but I'm guessing just
the blower running it uses about 6 amps.