What is the primary use of a compass and protractor in HVAC work?

What is the primary use of a compass and protractor in HVAC work?

• A. Provide digital measurements for airflow.
• B. Measure angles for duct elbows and fittings.
• C. Calibrate thermometers.
• D. Check electrical grounding.

Answer: (B)

Precise layout and fitting rely on accurate angle measurement. In HVAC sheet metal work, you must cut and assemble pieces so elbows and fittings line up correctly and seal well, preserving proper airflow. A protractor provides a precise angle reading between the duct axis and the cut line, so you can set the correct bend or cut for elbows and fittings. A compass assists in transferring that angle and in drawing circular arcs or locating centers for round ducts, which helps when you’re creating curved transitions or duplicating a specific radius. Together, these tools ensure joints match the design, avoid gaps, and maintain the intended airflow path. Tasks like measuring airflow, calibrating thermometers, or checking electrical grounding require different instruments, so they aren’t addressed by the compass and protractor.

Precise layout and fitting rely on accurate angle measurement. In HVAC sheet metal work, you must cut and assemble pieces so elbows and fittings line up correctly and seal well, preserving proper airflow. A protractor provides a precise angle reading between the duct axis and the cut line, so you can set the correct bend or cut for elbows and fittings. A compass assists in transferring that angle and in drawing circular arcs or locating centers for round ducts, which helps when you’re creating curved transitions or duplicating a specific radius. Together, these tools ensure joints match the design, avoid gaps, and maintain the intended airflow path. Tasks like measuring airflow, calibrating thermometers, or checking electrical grounding require different instruments, so they aren’t addressed by the compass and protractor.