"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 Hydro Crunch Inline Fan can help you to maintain a healthy grow room by efficiently move large volumes of air throughout your ventilation system. For high-powered ventilation & noise reduction, our inline booster fan runs 50% quieter than leading competitors. Contents of the combo:- 4" Hydro Crunch Centrifugal Inline Duct Fan 188 CFM- Hydro Crunch 4" x 12" Virgin Carbon Filter- 4" x 25' Non-Insulated Air Duct, 25 feet longHydro Crunch Inline Duct Scrubber Fan:- Allows the scrubbing of a charcoal filter!- Permanently lubricated bearing requires zero maintenance- Composite fan blades and center hub reduces noise and vibration- Essential equipment for positive pressure ventilation- Versatile installation; works in greenhouse, attic, bathroom, and warehouse.Specifications:- Volt/Phase: 120V/60Hz- Power Input: 87W- Amperage: 0.78A- RPM: 2500- CFM: 188- Noise DB: 56- 8-ft. pre-wired 120V cordHydro Crunch Charcoal Virgin Carbon Filter:- Pre filter included- High quality 100% virgin activated carbon- Aluminum construction: weighs 50% less than the competition- 99.5% effective at removing odors, organic compound and airborne particulates- Up to 18 months in life expectancy- Large mesh openings for a highly effective scrub- Designed for enclosed environment- 4" flange x 12" heightHydro Crunch Aluminum Non-Insulated Air Duct with 2 Aluminum Clamps:- Made from high quality aluminum, not only does the duct act as in intake and exhaust piping for active-cooled fixtures and reflectors, but also stores and dissipates heat at a steady rate, reducing room temperature fluctuations.- 3-ply ultra-thick construction for durability- Fire-resistance coating ensures maximum safety- Temperature range from 0 to 185+ F- 4" diameter x 25' feet long"