I have 4 1 inch holes drilled 2 inches from the bottom. I typically cap 2 of them, but this time they were all open. I have 3 1 inch holes in the lid for exhaust and typically keep one capped. Today I had all 3 open. I started with 2 intakes open and 2 exhaust vents open, then when the temp was low I opened the other vents.
Brinkmann Smoke N Grill