I tried it, it did not go well. Here's some snippets from a recent post I made. What causes dirty glass is steam, and it sprays out the ends of logs. Loading Front/Back with the ends facing the glass the steam sprays into the glass, and you need a high power focused air wash to overpower it and keep things clean. Side/side units, the steam coming out the logs spray into the sides first, the air wash doesn’t need to be as powerful it only needs to create an air barrier so moisture rich exhaust doesn't contact the glass. That lets side/side units have wider glass I believe, not to say I’m right. I came across that when I loaded my unit up front/back to see what happens (when it’s designed to be loaded side/side) and my air wash was woefully inadequate in overpowering the moisture coming out the ends of the logs spraying into the glass and it got absolutely covered in crap. I won’t do that again, loading side/side as my unit was designed my air wash keeps my glass nearly spotless. Also, I found I could not turn the air down low enough for fires in that configuration. I think side/side units have their air handle set higher than normal because the logs placed sideways impede air movement slowing things down so they compensate for that. Well, load them front/back and there's very little impedment to air flow. My fire started, and burned very fast even at the lowest air setting I couldn't turn it down enough. So, because of the dirty glass and I didn't have a lot of control of the fire I don't burn front/back anymore. I recommend you try it at least once, don't pack it too full incase you find you can't turn the air handle down enough like I did. I was pretty glad I hadn't stuffed it as much as possible as it would've been out of control.