How many 60-degree turns are allowed in ducting?

When it comes to ducting design, it is a standard practice to limit the number of 60-degree turns to ensure optimal airflow and minimize pressure loss. Allowing one 60-degree turn is considered acceptable because it balances the need for flexibility in duct routing with the requirement to maintain efficient air movement.

Excessive turns, specifically any more than one 60-degree turn, can result in significant turbulence and increased resistance within the duct system, which can diminish performance and lead to inefficiencies. This standard helps in facilitating better air distribution and reducing the risk of noise and potential issues related to duct system performance.

In many applications, keeping to a single 60-degree turn ensures that the integrity of the airflow is maintained, while also adhering to building codes or best practices outlined in mechanical engineering guidelines.