Welcome! All the SI's are the same but different. Lol. The volume of your 5D will make a lot of the rules that the others with smaller units follow not applicable. For example, with my model 4, I'm safe using interior drip pans where others cannot due to air flow interruption. One of the design flaws (IMO) on the smoke box is the number and size of holes in the bottom. There is simply too much oxygen for the strength of our heating elements. Experiment but consider covering some holes with foil is you feel like you are getting combustion. I use a chip screen and some foil in mine. Enjoy the new toy!