ChadVKealey
TVWBB Pro
ChadV, you can close the top vent down some if you need to get the temp down a little, but never close it all the way. You will get creosote on your food. You should be able to control your temps with just the bottom 3 vents. And if you cant get the temp up will all three bottom vents open, you can always open the door for a short time and the temp will come up
I had left it closed after the previous cook. Somehow I forgot to open it back up when I put the lid on. In my defense, it was near midnight and this was my first overnight cook in anything but a crock pot.