Newb here that just purchased a Lennox Winslow pellet stove. Plan is to install in basement family room (where we spend most time watching TV). Walls are insulated and sheet-rocked and the space is open concept, around 600 sq ft; goal is only to heat the lower level while we are down there. Vent will go up 7' and terminate out the sill. Questions are: 1) Will 3" vent be adequate to the task (EVL is 14.5)? I haven't purchased vent yet and want to do it right the first time - but don't necessarily want overkill. 2) Owner's manual states nothing about OAK in general, except that it's required in mobile home installations. Thoughts? Seems to be the way to go from reading up on this forum, but if I don't have to install one I'd prefer that. Plus I have no easy/attractive way to run it out except up along the vent pipe. 3) Anyone suspect negative draft issues due to basement install? I'll add that upstairs and downstairs are separated only by short run of stairs (no door at top of steps, etc). Thanks for any advice! Currently waiting for stove and deciding on hearth designs (building my own) and vent options.