I have been planning to replace the furnace and a/c and water heater ... for 3 years now. Hopefully next year.
Anyway, I took some photos just now. It is a York furnace. The label says motor is permanently lubricated.
There is definitely no "draft inducer" fan. I can see the flames through the grill. Some combustion air seems to come in through the open pipe nearby and the rest from the basement.
There is a schematic attached to the back of the blower compartment door. They seem to be using HIGH and MED speeds (although I only hear high speed operation) and the LOW speed is not being used. Using MED and LOW settings may reduce the noise but I won't risk messing up the wiring in this cold weather.