What is the required size of support bands for flex ducting?

The correct size of support bands for flex ducting is 1-1/2 inches. This size is typically recommended because it provides adequate support while allowing for flexibility and movement of the ducting material. Flex duct is designed to be lightweight and flexible, which helps with installation but also necessitates proper support to prevent sagging or collapsing over time.

Using support bands that are too small may not adequately hold the duct in place, potentially leading to airflow issues or damage. On the other hand, support bands that are too large can be cumbersome and may not effectively grip the ducting, which can compromise its performance. The 1-1/2 inch size strikes a balance, ensuring that the duct is properly supported without hindering its intended flexibility or effectiveness in the HVAC system.