You want even grilling: One of the downsides of using a charcoal grill is ensuring that the entire grilling area is evenly heated. Spreading the charcoal evenly and avoiding hot spots is difficult. Traeger’s pellet grilling system overcomes this problem with a fan that evenly distributes the heat throughout the grilling area, much like a wood-fired oven would have.
160ºF up to 500ºF temperature range for slow smoking to grill (25,000 BTU). Stainless Steel meat probe measures internal food temperature. Simple Ash Cleanout System (patented).Smart Smoke Technology. Stainless Steel fire box. Digital controller automatically maintains cooking temperature. Grease Management System. Blue LED digital temperature display..Bottom utility rack. Large, heavy wire grilling area dimensions: 19.5" x 22". Included warming rack provides (570 sq. in. total cooking surface).
I have owned my YS640 for about 9 months now. Before I bought this I researched smokers/grills for about 2 years because I had very little experience with them & cooking in general. With the help of a few good websites I have produced some great food. There is a ton of room to cook on & the heat stays pretty much where you want it. Only a few issues I have had is that where the stack mounts to the side of the grill it drips. I did have a scratch on mine from the shipper & when I called about it I was sent a can of matching high temp paint very quickly. One thing that I like the most about this smoker is it is heavy. You can tell that this thing was built to last.
As you could probably guess from the name of these smokers, they run by burning wooden pellets. Typically, a pellet smoker comes with a hopper on the side where the pellets are added. When you turn on the smoker, pellets will move from a hopper to a burn pot where they will be burned and the smoke will be diffused by a fan. A thermostat measures the temperature of the grill and determines how many pellets to burn while keeping a consistent temperature. 

Most grills feature a primary cooking area (the main grate) and a secondary cooking area (additional racks). In a pellet grill, there’s less difference between the two grilling areas because it mainly cooks by indirect heat, so the temperature is the same throughout the grill. It’s best to pay attention to a pellet grill’s total cooking area because it is the sum of the primary and secondary cooking areas.
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