Hi, I'm building an 80 gallon reverse flow offset.
I'm using 1/4 inch steel pipe with a 24 inch diameter, which I picked up. I've used the calculator on this site to give me the measurements I needed, which was great.
Cook chamber length 43 inches
Firebox, also 24 inch pipe has a length of 15.8 inches which gives me a volume about 10% more then the recommended for the cc volume (luckily) as it was an off cut.
Segment calculator gave me a segment height of 3.5 inches. I used a figure of 3.8 inches to give me better flow, putting the rf plate at 7.6 inches from the bottom.
First shelf is at the middle of the cook chamber, so just over 4 inches from the RF plate.
Second shelf is 4.5 inches up from the first shelf.
For the chimney, I'm using pipe with in internal diameter of 4.1 inches, extending 35 inches above the cook chamber. I'm not planning on using a plenum. I am planning on cutting the exhaust pipe at a 45 degree angle and welding it to make a right angle. I will then weld this to the end of the cook chamber.
Now the question I have, that I am hoping for some help with, is at what height should i place the exhaust.
From what I can see, I would have thought it should be at the height of the lower shelf. But before I cut into the end of the cook chamber, I would like to confirm.
Your help would be very much appreciated. I have learnt an enormous amount about smoker builds from this forum, enough to understand the basics and keep me very enthused.
I've attached some pics of my progress so far. Its been a slow journey, as its been my first time working with metal. Learning how to weld has been great. What would we do without youtube!
1/4 inch steel sheet cut to make the legs. 1/4 steel sheet bent to make the rf plate. I was pretty pleased with the bend.
Need to finish welding the fb, and the end of the cc which are only tacked on, then cut the drain, shelfs, etc. Door also needs to be straightened out, so still a way to go, but I'll post pics as I go.
I'm using 1/4 inch steel pipe with a 24 inch diameter, which I picked up. I've used the calculator on this site to give me the measurements I needed, which was great.
Cook chamber length 43 inches
Firebox, also 24 inch pipe has a length of 15.8 inches which gives me a volume about 10% more then the recommended for the cc volume (luckily) as it was an off cut.
Segment calculator gave me a segment height of 3.5 inches. I used a figure of 3.8 inches to give me better flow, putting the rf plate at 7.6 inches from the bottom.
First shelf is at the middle of the cook chamber, so just over 4 inches from the RF plate.
Second shelf is 4.5 inches up from the first shelf.
For the chimney, I'm using pipe with in internal diameter of 4.1 inches, extending 35 inches above the cook chamber. I'm not planning on using a plenum. I am planning on cutting the exhaust pipe at a 45 degree angle and welding it to make a right angle. I will then weld this to the end of the cook chamber.
Now the question I have, that I am hoping for some help with, is at what height should i place the exhaust.
From what I can see, I would have thought it should be at the height of the lower shelf. But before I cut into the end of the cook chamber, I would like to confirm.
Your help would be very much appreciated. I have learnt an enormous amount about smoker builds from this forum, enough to understand the basics and keep me very enthused.
I've attached some pics of my progress so far. Its been a slow journey, as its been my first time working with metal. Learning how to weld has been great. What would we do without youtube!
1/4 inch steel sheet cut to make the legs. 1/4 steel sheet bent to make the rf plate. I was pretty pleased with the bend.
Need to finish welding the fb, and the end of the cc which are only tacked on, then cut the drain, shelfs, etc. Door also needs to be straightened out, so still a way to go, but I'll post pics as I go.
