Which term describes a cheap header option formed as a single tube?

• A. Mandrel Bend
• B. Formed
• C. Merge
• D. Thermal Barrier

Answer: (B)

Formed describes shaping a single length of tubing into the desired header path using dies or rollers. This creates a one-piece tube with the bends built in, which is typically cheaper because it minimizes welding and assembly steps. Mandrel bends, while smooth and consistent, involve additional tooling and can raise cost. A merge refers to how multiple tubes are joined at a collector, not to how a single tube is formed. A thermal barrier is about insulating heat, not fabrication. So the option that best fits a cheap header option formed as a single tube is formed, since it highlights a simple, one-piece manufacturing approach.