Well, after close to 3 years with my Daniel Boone, I figured out why they call it open flame technology. I was cooking some T-Bones and had it cranked up to 480 with the grates in the open position and my old fire shield with no deflectors on. I had scraped down the drip tray prior to starting, but the dropping grease and the residual left on the tray ignited. Fortunately I was close by and was able to save the beef, but the interior on the chimney side that ignited did not fare as well. I now have bubbling powder coat and bare metal on that side. I might consider getting those grill grates now or go back to the propane for the high/hot cooks.