Red Seal Sheet Metal Worker Practice Exam

What does the term “cross break” refer to in ductwork fabrication?

1. A seam for joining two sections

2. A bend applied to reinforce structural integrity

3. A type of insulation method

4. A decorative finish applied to metal

The correct answer is: A bend applied to reinforce structural integrity

The term "cross break" specifically refers to a bend applied to ducts to enhance their structural integrity. When a cross break is introduced into ductwork, it creates additional stiffness and helps to prevent the duct from flexing or collapsing under the pressure of airflow. This reinforcement is particularly important in larger duct systems where the risk of distortion is higher, ensuring that the duct maintains its shape and performs effectively. The application of cross breaks is a standard practice in duct fabrication, especially in the construction of square or rectangular ducts. This added rigidity is crucial for maintaining the efficiency of the HVAC system, reducing noise and improving airflow performance. The other options relate to different aspects of ductwork. Joins between sections are critical, but they do not pertain to the specific term "cross break." Insulation methods address temperature control and energy efficiency but do not involve adding structural features to the duct itself. Decorative finishes might enhance aesthetics but are not a function of the duct's structural capacity.