FUSION TECH / 13
12 / OVEN BREAKPOINT GUIDE
Placing a truck in your oven affects the flow of the high and low velocity airstreams that create the breakpoint. Any obstruction in the oven cabinet will cause the air flow to change —meaning the design and placement of the trucks you use in your oven is critically important. Breakpoint and Oven Trucks Gaps in the Oven Proper airflow in an oven requires a 12” gap on the side walls and along the bottom of trucks to maintain the high and low velocity airstreams in order to create the breakpoint. The gap between carts in a double wide over should be NO MORE than 6-8”, otherwise a chimney effect is created and the airstreams move up to the return duct before creating the breakpoint.
Truck Design The design of the rack used in the smokehouse can greatly affect airflow in the oven, and hinder the formation of the breakpoint.
Truck Design Guidelines • Unobstructed Sides • Supports on Front of Truck • 12” Floor Clearance • 2 Wheel Design
As mentioned above, the high velocity airflow travels down the wall of the oven and across the floor to meet the low velocity airflow. In other words, it must travel under the rack in the oven.
Any obstructions in the path of the high velocity airflow can slow down or stop the airflow.
A smokehouse rack designed with a low clearance (less than 12”) will cause an airflow obstruction in the oven. This low design essentially creates a “wall” on the floor of the oven, breaking the high velocity airflow and affecting where the breakpoint occurs.
Proper Truck Loading How you load the trucks in an oven affects the high and low velocity airstreams as well. The optimal loading pattern is to fully load the oven. When cooking a partial batch, evenly space your product over every cart. Otherwise air will flow to the empty spaces and you’ll see a decline in yields and consistency.
In order to keep the high velocity airflow from being obstructed, the rack should have minimal obstructions up to 12 inches from the floor.
Proper Design
Improper Design
Correct Loading of Oven
Incorrect Oven Loading
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Unobstructed Sides Supports on Front of Truck
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12” Floor Clearance
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Obstructed Sides
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3 Wheel Design Blocks Airflow
2 Wheel Design
Framework Blocks Airflow
Air will naturally flow across this area of the oven as there is no resistance, rather than where the trucks are.
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