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S2 Ep3: Draw Explained: Volume, Velocity, and How Air Really Moves in an Offset Smoker
If your pit has hot spots, uneven temperatures, or smoke that never seems to behave, this episode explains why.
In this episode, Frank Cox — The BBQ Pit Engineer — dives deep into one of the most misunderstood concepts in barbecue: draw. This isn’t theory for theory’s sake. It’s a practical breakdown of how air actually moves through an offset smoker, why common airflow myths don’t hold up, and how understanding volume and velocity can completely change how your pit runs.
You’ll learn why smoke does not swirl through a cook chamber like a corkscrew, why forcing air under the grates isn’t the magic solution people think it is, and how hot air naturally moves through a smoker much like water through a drain — just in the opposite direction.
This episode connects real-world airflow behavior, pit design, and fire management so you can stop fighting your smoker and start working with it.
⏱️ Chapters / Timestamps
00:00 – Cold Open
Why hot spots and uneven temps are really happening
00:09 – What “Draw” Really Means
Why draw is one of the most misunderstood terms in barbecue
00:59 – Common Frustrations with Offset Smokers
Uneven temps, stagnant air, dirty smoke, and hot spots
03:09 – Visual Clues Inside the Cook Chamber
Meat color, hot zones, and what the bottom of a brisket tells you
04:58 – The Corkscrew & “Push the Air Down” Myths
Where these ideas came from — and why they don’t hold up
06:09 – A Pivotal Moment in Understanding Airflow
How real-world air balancing experience changed the way Frank views smokers
09:44 – The First Big Truth About Air Movement
Why air does not swirl through a smoker like a corkscrew
11:21 – Draw = Volume and Velocity
How airflow is controlled by how much air moves and how fast it moves
12:10 – The Sewer Drain Analogy
Why hot air hugs the top of the cook chamber
14:40 – Why Smokers Are Not Pressurized Systems
What pressure actually means — and why offsets can’t create corkscrew airflow
18:07 – Understanding Velocity
Using the garden hose analogy to explain airflow speed
20:39 – Turbulence, Eddies, and Real Airflow Behavior
What actually causes swirling and mixing inside a smoker
23:38 – Offset vs Reverse Flow Designs
How baffles and tuning plates change airflow — and the tradeoffs involved
27:38 – The Real Job of a Smokestack Damper
Balancing volume, velocity, and back pressure
29:31 – Actionable Takeaways
How to cook with airflow instead of fighting it
33:36 – Final Thoughts & Call to Action
Inviting BBQ Nerds to engage, share, and keep learning
View all episodes
By The BBQ Nerds Podcast
5
55 ratings
If your pit has hot spots, uneven temperatures, or smoke that never seems to behave, this episode explains why.
In this episode, Frank Cox — The BBQ Pit Engineer — dives deep into one of the most misunderstood concepts in barbecue: draw. This isn’t theory for theory’s sake. It’s a practical breakdown of how air actually moves through an offset smoker, why common airflow myths don’t hold up, and how understanding volume and velocity can completely change how your pit runs.
You’ll learn why smoke does not swirl through a cook chamber like a corkscrew, why forcing air under the grates isn’t the magic solution people think it is, and how hot air naturally moves through a smoker much like water through a drain — just in the opposite direction.
This episode connects real-world airflow behavior, pit design, and fire management so you can stop fighting your smoker and start working with it.
⏱️ Chapters / Timestamps
00:00 – Cold Open
Why hot spots and uneven temps are really happening
00:09 – What “Draw” Really Means
Why draw is one of the most misunderstood terms in barbecue
00:59 – Common Frustrations with Offset Smokers
Uneven temps, stagnant air, dirty smoke, and hot spots
03:09 – Visual Clues Inside the Cook Chamber
Meat color, hot zones, and what the bottom of a brisket tells you
04:58 – The Corkscrew & “Push the Air Down” Myths
Where these ideas came from — and why they don’t hold up
06:09 – A Pivotal Moment in Understanding Airflow
How real-world air balancing experience changed the way Frank views smokers
09:44 – The First Big Truth About Air Movement
Why air does not swirl through a smoker like a corkscrew
11:21 – Draw = Volume and Velocity
How airflow is controlled by how much air moves and how fast it moves
12:10 – The Sewer Drain Analogy
Why hot air hugs the top of the cook chamber
14:40 – Why Smokers Are Not Pressurized Systems
What pressure actually means — and why offsets can’t create corkscrew airflow
18:07 – Understanding Velocity
Using the garden hose analogy to explain airflow speed
20:39 – Turbulence, Eddies, and Real Airflow Behavior
What actually causes swirling and mixing inside a smoker
23:38 – Offset vs Reverse Flow Designs
How baffles and tuning plates change airflow — and the tradeoffs involved
27:38 – The Real Job of a Smokestack Damper
Balancing volume, velocity, and back pressure
29:31 – Actionable Takeaways
How to cook with airflow instead of fighting it
33:36 – Final Thoughts & Call to Action
Inviting BBQ Nerds to engage, share, and keep learning