VIVOSUN 6 Inch 440 CFM Inline Duct Fan with 6" x 18" Carbon Filter Odor Control with Australia Virgin Charcoal POWERFUL AIR FLOW FAN: Heavy hitting blower with a fan speed of 2450 RPM; Puts out only 50 dB noise level. Moves air through your target location efficiently for optimal ventilation. SUPERIOR CARBON FILTER: 1050+ RC 48 Australian Virgin Charcoal Bed. Dimensions: 6'' x 18'' EFFECTIVE ODOR CONTROL: The carbon filter eliminates some of the most undesirable odors, pungent smell and particulates from indoor grow tent, hydroponics grow room. FREE PRE-FILTER INCLEDED: We recommend replace the pre-filter every 6 months or after completion of each grow cycle. VERSATILE APPLICATIONS: Kitchens, Bathrooms, Greenhouses, Grow Rooms, Grow Tents, etc Safe temperature range for operation: - 104 to 149; Safe air-humidity range: 5% to 95% RH (Relative Humidity) Presence of electrically-conductive air particles: the air in the area of operation should be free of significant concentrations of electrically-conductive particles such as active carbon, ferrous powders, etc. Suitable for green rooms / grow tent (hydroponics), hospital rooms, commercial cooling and industrial applications. Grow tents, cupboards and cabinets. Anywhere without a roof/ceiling cavity to displace extracted air into. Air-cooled lighting. Lower-level floors of double/triple story houses. Window to window ventilation applications. Hot or cold &#034;filtered air transfer&#034; from one air conditioned room to another.