I believe its 5x8, but its the only standard size. I use one and like it. The pellets can be used for both hot and cold smokes as long as it isn't not August in south Louisiana. LOL
The dust tubes are basically for cold smoking.
I enjoy my AMPs, it does require a bit of a learning curve, but if I can figure it out its not hard.....
It fits really snug, I actually use it on a grate if at all humanly possible better air circulation. You may need a 12 in crescent hammer to adjust the aux smoke generator, again if a redneck can achieve it you should have no trouble.
PS I like pecan
PSS Do yourself a favor and go ahead and get a good little blow torch.