Hey Charlie – I’d leave that grate wide open if you want maximum heat. If the grates are only over the burn pot, then you can do sort of a two zone cook (indirect vs direct heat) by putting a thicker steak, chop, or piece of chicken on the ‘non direct’ side to get up to a temp that’s 15 or 20 degrees lower than your target. Then, finish off over the burn pot area. Just one idea.
I did a lot looking around at pellet smokers before buying the ys 640. This thing is amazing! I have been cooking BBQ for about 15 years. I owned a Gator pit entertainer which is made in Houston Texas (stick burning pit) and I currently own a $25,000 Ole Hickory Pit EL-EDX which can cook 700 lbs of BBQ at once. I wanted something smaller to cook for family. The ys 640 turns out PERFECT Q every time! The amount of smoke is just right. Plenty of smoke flavor without over smoking which is very easy to do in my other pit. This is an EXCELLENT product which I strongly recommend.
Although these are marketed as grills, they do much more, including baking or roasting. Because they heat by convection, you might not get the grill marks that a gas or charcoal grill will give you, but you also won’t have the flame-up problems. While many pellet grills offer high cooking temperatures, the maximum depends on ambient temperature and wind. Many users wrap their grills in special insulating covers to help maintain heat, reduce fuel use, and reach the higher temperatures they desire.