Quadra Fire Air Control Questions

A friend of mine has a Quadra Fire (don't know model number but it is at least 6 years old as he bought house with it in it; would call it mid-sized) pedestal stove. He did not have an owner's manual so has never really known how to use the stove, mainly with the 2 air control levers (one on bottom below door, one on side). He simply leaves both pushed all the way in all the time and says it burns ok that way so why rock the boat. He goes through a bunch of wood and I told him I am sure he could adjust those levers to extend burn times. From what I gather from researching some archive posts, I take it that one of these levers controls air when starting/reloading and the other is the primary burn control lever.

So long story short, can a Quadra Fire owner give me the lowdown on what the 2 air control levers do, and in general terms how to adjust them to control burn rate? Thanks!

Thanks everyone! My friend is a stubborn ol' mule, but maybe I can teach him a thing or two about his stove finally. I knew something was not right with the rate of wood he uses, plus the fact there are two controls that he never touched.