Power consumption of 1/10 HP motor.

You need to know the power factor in order to get a meaningful number here, it may only be around 0.5. One of those $20 Kill A Watt devices is perfectly adequate for measuring the true power consumption.

Shaded pole motors are not very efficient, you'll notice they tend to run very hot. Still, without knowing the actual load or the power factor you're flying blind and anything is just a guess, but it's easy to measure.

True but I have neither the motor or a Kill A Watt meter on hand.

1/10 HP is only about 75W. Obviously, the power factor and most likely the efficiency is going to be piss poor. How much did this thing cost? My guess is that any price is too high for what you are getting.

Bill

The 3.4 amp specs are typical for attic exhaust fans. Should I assume that the nameplate current draw is "locked rotor" value provided in case someone decides to install 5 of these on one 15 amp circuit?

I am only interested in what the motor normally draws while running. If two of these fans require nearly 800 watts to exhaust and cool my attic, I am concerned. If its only 300 watts I am less concerned. Does anyone have a ballpark on this?

I would guess about 140W, but that's only a guess. The power factor if uncorrected is probably only about 0.5, so the VA will be around double what the wattage is, and the label is for worst case conditions. In the real world, the fan is probably not pushing the motor to produce its max rated horsepower.