Purpose of Franklin’s smokestack design? (wide exhaust opening)

For as much as AF talks about air flow, his backyard smoker is designed to run with the FB door closed. I heard an interview with him back in June, I think, on Gregg Rempe's podcast. He said they've drilled the exact number of holes in the door for the smoker to get the proper amount of air flow with the door closed.


Scroll down here to a good pic of the door. The smoker he used in his Master Class vids, did not have these holes, he smoked with the door barely cracked open



https://franklinbbqpits.com/

Franklin talking about his pit with Rempe

https://youtu.be/Rt_8m52JNL4?t=1941
I think he had to design it to run with the door closed. Some idiot would probably sue if a coal jumped out and burned the house down because he was cooking on a wood deck.

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I think he had to design it to run with the door closed. Some idiot would probably sue if a coal jumped out and burned the house down because he was cooking on a wood deck.

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Well, maybe, but I think these backyard smokers don't need a lot of air flow.

As I said above, in the Master Class vids he's cooking with the door barely cracked open.

Workhorse put a damper on their FB door, why did they do that ?

And here's a tweet from an owner who barely has the door cracked and the damper wide open. This Workhorse 1975 doesn't need a lot of air, either.

https://twitter.com/barbersbbq/status/1291716309454131205?s=19
 
Maybe giving us both options is why. I like using the intake, you like cracking the door. We can both use the cooker the way we like.

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No, I don't want a lot of air flow on my Brazos, I can get too much air flow that bottom burns the meats.

I've found the Brazos cooks a lot better with the door closed and damper 1/2 to full open.
 
Well, maybe, but I think these backyard smokers don't need a lot of air flow.



As I said above, in the Master Class vids he's cooking with the door barely cracked open.



Workhorse put a damper on their FB door, why did they do that ?



And here's a tweet from an owner who barely has the door cracked and the damper wide open. This Workhorse 1975 doesn't need a lot of air, either.



https://twitter.com/barbersbbq/status/1291716309454131205?s=19



JD told me that the damper is there for insurance purposes. I only use the door.


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Just for kicks I'll throw in my two cents. I have built a few pits and modified a few more. After going to a collector for the exhaust I will never go back. The draft in my case is so much better. Even with the cooking chamber door open I can see the smoke zipping across. I no longer get that big billow of smoke and or heat when I open the door. Not to say that none comes out but it minimal. Easier to keep it clean burning. I have a door on door design on my fire box. When I'm first building and lighting the fire (I pour a chimney of hot lump on a stack of splits) I have the large main door open. Once the fire is going I regulate temp and add wood through the small door. I usually have the small door open less than 2" and it runs around 275 for the most part. I'll attach a few pics for whats its worth. Oh, and my collector is placed between the lower and upper racks. Where the firebox inflows into the cooking chamber there is a 6" deflector that is on a 20 degree down angle. And the stack end is the hot end by about 10 degrees.

Works for me.


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In terms of "collectors" being good or bad, Johnson Smokers has a similar design with two independent stacks at grate level which sort of splits the difference. His smokers have a good reputation for drafting well. To me, both designs appear to pull smoke across the entire grate of meat without any deadspots in the cook chamber.
 
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