Newbie with ? re: Aux-air on Quadrafire 7100FP

[shwejw]

Long time listener, first time poster. We recently (6mos ago) moved into our newly completed home in which I had a 7100FP installed to serve as the primary heating source. I've used the stove only a few times and it works well. I would like to get a positive pressure going in the house and believe that the aux-air will enable it. Currently I have only been using the unit w/the outside air source (knob on bottom right turned to open). The contractor/installer ran about 5ft of 6" metal flex duct from the aux-air port on right of the unit down into the house crawlspace, which I can easily plumb all the way to the back hallway of the house where I would like warm air to be drawn to (about 40ft away). A few questions:

1) Does sliding the lever on the bottom to enable aux-air automatically shut off the outside air?
2) If I want to use the aux-air, should I turn the outside air knob off to shut off outside air, or must that remain on all the time? e.g. if using aux-air, I am actually using both outside and aux air?
3) Any other recommendations to enable pisitive pressure in the house?

Thanks in advance for the help....some pics of our new home/hearth.

Steve