R4E400-AP15-10 - 

ebm-papst Centrifugal Fans and Blowers – Backward Curved Blades
ebm-papst centrifugal fans and blowers featuring backward curved blades are an ideal solution to a wide range of application requirements and are ideally suited for intake suction use. Additionally, ebm-papst centrifugal fans and blowers, specifically those used for intake suction using backward curved blades, do not require a scroll housing – increasing ease of use and versatility.