Originally Posted by dinosdeuce
Need a little help in figuring out draft holes in the bottom. Since I am build a vertical I haven't quite figured out what dimensions to put in the field in Feldon's BBQ Pit Builder to get a good answer. using the following dimensions:
Fire crate will be 5" above the bottom
cylinder cook chamber 24" dia x 24 long
fire box dim round 24" X 18" long
fire box intake round 2" holes
it states 7.78 holes which would be 4 holes per side.
With the proper spacing the holes seem like they will be, basically all the way around the bottom of the smoker.
I was looking at putting in 3 x 2" holes on opposite sides at grate level with a sliding dampener. Will that be sufficient enough??
As indicated we have 1@4", it is just a short length of 4" exhaust tubing from a muffler shop. We used the same size for our exhaust stack so we are matched up at about 12.5 sq in in & out. Works fine: we run the exhaust wide open all the time and the intake wide open to get started then probably 25%-50% during a cook. I would think any combination that gives you close to the 12.5 sq in would work fine. A note, we put ours directly under the firebox door, I would suggest moving one or more to the sides, ours can conflict with the firebox door; not a big deal but it can be avioded.
Finally, you can get gasket material at bbqgaskets.com.