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.
Air Circulation
Story: These massive BIHS 890 (Backward Inclined) ID air circulation fans were built in 2006 for a US gypsum company. Today, 9 years after they were built, the fans are running strong. According to the plant, the only repairs they have performed to date are occasional belt replacements (due to 24/365 operation).