At what angle should ductwork ideally be installed to minimize pressure loss?

Installing ductwork as close to horizontal as possible is ideal for minimizing pressure loss because this orientation reduces friction and turbulence as air travels through the ducts. When ducts are installed horizontally, the airflow can maintain a more streamlined path, allowing for a smoother transition, which helps to maintain system efficiency.

In contrast, steep angles can create obstructions and increase resistance, leading to higher pressure losses. Vertical installations can also contribute to increased turbulence and potential issues with drainage and condensation in the system. A 45-degree angle, while better than a steep angle, can still introduce some turbulence and pressure drop compared to a horizontal run. Therefore, maximizing horizontal installation of ductwork is beneficial for system performance.