Why is it important to use a fan inlet box, especially when space constraints prevent a long, straight duct run? While an inlet box can slightly reduce fan performance, it significantly minimizes system effect. A well-designed inlet box helps turn air into the fan more concentrically, reducing pressure loss to as little as half an inch, especially at lower velocities. Fan inlet boxes help manage airflow into the fan, reduce turbulence, and can support transitions or directional changes in ductwork.
