Every commercial kitchen ventilation system needs a centrifugal upblast exhaust fan. It’s one of three main components of a complete exhaust hood system: a hood, ductwork, and an exhaust fan. Without a fan, your kitchen would be probably become filled with smoke and covered in grease.
You may never even see your upblast exhaust fan, but knowing what it is and understanding how it fits into your exhaust system is still important, especially when it comes to troubleshooting issues and properly maintaining your system.