In a duct system, the angle between the sides of a transformation piece (from larger to smaller) must be less than _____________.

In duct systems, the transition between different sizes of ducts, such as from a larger duct to a smaller duct, is crucial for maintaining efficiency in airflow and minimizing pressure drop. The angle of the transition piece plays an important role in ensuring smooth airflow.

An angle of less than 60 degrees is recommended for the sides of a transition piece to facilitate the gradual change in area. This helps prevent turbulence and excessive resistance to airflow, which can occur if the angle is too steep. A more gradual transition allows the air to adjust more smoothly as it enters the smaller duct, maintaining velocity and minimizing disruptions in flow patterns.

Transition pieces with angles greater than 60 degrees can lead to increased turbulence and negative impacts on system performance, as sharp transitions disrupt airflow dynamics. Therefore, adhering to the guideline of maintaining an angle of less than 60 degrees is essential for optimal duct design and efficient air distribution.