The Texas BBQ Forum

I just started on my build. 20" pipe 3/8" wall. CC is 44". FB is 22". 6" x 6" FB intake and 58 sq in flow from FB to CC. On the other end I have a 36" long 20" diameter smoking tower/ warming tower that will be baffled to to control flow into the tower. I'm using a 28" long exhaust stack on CC. My question is " how long should the exhaust stack be on the smoking tower? It will be 4" also.

Love this site BTW!

Fish and teach wrote:I just started on my build. 20" pipe 3/8" wall. CC is 44". FB is 22". 6" x 6" FB intake and 58 sq in flow from FB to CC. On the other end I have a 36" long 20" diameter smoking tower/ warming tower that will be baffled to to control flow into the tower. I'm using a 28" long exhaust stack on CC. My question is " how long should the exhaust stack be on the smoking tower? It will be 4" also.

Love this site BTW!

I would use two 4" ID exhausts 6" to 12" tall.
They would exit on the side at the top.
Or one 6" exhaust 12" tallat the same position.
The upright is your exhaust, you are just looking for a way for the heat/smoke to leave the chamber without stalling.
I hope this helps.

Thanks k.a.m. That's what I was thinking but I figured many of you had much more experience with this.

Your cc stack size and length need to be increased. Diameter should be 6 inches. Stack should start at the top and extend 36 inches above the top of the cc. The bottom of the stack should be cut on a angle provide a better uniform flow of heat/smoke across the meat this will provide a more uniform temp in the cc. You need the same or more exhaust volume than the intake air of the fire box.

chas wrote:Your cc stack size and length need to be increased. Diameter should be 6 inches. Stack should start at the top and extend 36 inches above the top of the cc. The bottom of the stack should be cut on a angle provide a better uniform flow of heat/smoke across the meat this will provide a more uniform temp in the cc. You need the same or more exhaust volume than the intake air of the fire box.

The 4" exhausts in question are on the upright portion of the cooker. There is no need in having a long exhaust on an upright chamber, it in itself once heated will created the draft. You only need an adequate exit place.
The 4" x 28" exhaust he has on the 20" horizontal cooking chamber is more than adequate to draft that portion of his cooker.

I weighed my incompleted smoker with 3 bathroom scales and it's approaching 600#. The grinding left to do won't knock off much so I'm gonna leave the smoker end off since it's about 100#. I went with 4"x28" stack (per Feldon's calculator). Waiting for the weather to get on the top side of 32 since my building occurs outside (we need a shivering smiley!) to finish her up. May go run a chimney of charcoal through the pit if I get cabin fever just to check draft before I finish strapping the doors and grinding down smooth. Thanks for all the advice guys. I love is place

Fish and teach, I just noticed you were located in Riesel. I'm located in West, so if you ever need any help let me know. Looking forward to seeing the finished build!!!

Philip

4Mfarms wrote:Fish and teach, I just noticed you were located in Riesel. I'm located in West, so if you ever need any help let me know. Looking forward to seeing the finished build!!!

Philip

Cool. Maybe we can get together sometime and compare notes!

I would be more than happy to share!!!