Hydro Crunch 410 CFM 6-inch Centrifugal Inline Duct Fan with Variable Speed Controller (GDF150)Fresh air is a crucial component for a healthy harvest. Growing plants transpire water vapor and moisture in the grow room which can cause high humidity that can stunt your plants and destroying your crop. Our inline fan can help you to maintain a healthy grow room by efficiently move large volumes of air throughout your ventilation system. It is easy for placement with its universal mounting bracket and it is quiet the lubricated bearing. Its a great