Residential HVAC Installation Practice Exam 2026 - Free HVAC Practice Questions and Study Guide

Self-tapping screws are commonly used with round flexible duct because they provide a secure and long-lasting connection. They are specifically designed to create their own hole as they are driven into the duct material, making installation easier and more effective. Using self-tapping screws ensures that the duct remains properly sealed and connected, preventing air leakage and improving the overall performance of the HVAC system.

On the other hand:

- Duct tape is not suitable for securing round flexible duct as it may not provide a lasting and secure connection.

- Zip ties are not as effective as self-tapping screws in securing round flexible duct as they may not hold the duct in place securely.

- Rivets are not commonly used for connecting round flexible duct as they may not provide the flexibility required for duct installation and maintenance.