What is the maximum deflection angle allowed at each miter?

The maximum deflection angle allowed at each miter is 90 degrees. This standard is based on the need to balance efficient airflow and minimize turbulence within HVAC duct systems. Exceeding this angle can lead to increased resistance in the airflow, resulting in reduced system efficiency and potential noise issues.

In systems designed for heating, ventilation, and air conditioning, maintaining proper airflow is crucial for performance and energy efficiency. When mitered joints exceed 90 degrees, the airflow dynamics can become significantly disrupted. This ranges from increased pressure drops across the duct to the creation of dead spots where air cannot effectively circulate, both of which undermine the system's intended efficiency.

Therefore, adhering to the 90-degree limit at each miter is essential for ensuring optimal performance of the HVAC system.