Designed to eliminate odors and chemicals for grow tents and hydroponics room. Features premium-grade Australian charcoal with higher adsorption and longer life rating. Contains heavy-duty aluminum flanges, galvanized steel meshing, and clothed pre-filter. Enables maximum airflow passthrough for both intake and exhaust configurations. Duct Opening: 4” | Length: 13" | Airflow Rating: 210 CFM | Carbon: Australian RC412 at 1200+ IAV | Thickness: 38mm Duct Opening: 6” | Length: 16" | Airflow Rating: 410 CFM | Carbon: Australian RC412 at 1200+ IAV | Thickness: 38mm Duct Opening: 8” | Length: 20" | Airflow Rating: 770 CFM | Carbon: Australian RC412 at 1200+ IAV | Thickness: 38mm Duct Opening: 10” | Length: 24" | Airflow Rating: 1249 CFM | Carbon: Australian RC412 at 1200+ IAV | Thickness: 38mm Duct Opening: 12” | Length: 28" | Airflow Rating: 1668 CFM | Carbon: Australian RC412 at 1200+ IAV | Thickness: 38mm PRODUCT DESCRIPTION The high-airflow duct filter is designed to use activated carbon to eliminate odors and chemicals, popularly used for hydroponics, grow rooms, kitchens, smoking areas, and other ventilation projects. Features premium-grade Australian Virgin charcoal bed. The filter can be used in conjunction with an inline duct fan to act as both intake and exhaust configuration. Heavy-duty construction contains aluminum flanges and dual-sided galvanized steel mesh. The flanges can also be reversed to prolong the life of the filter. Includes a machine washable pre-filter cloth to prevent carbon residue. PREMIUM GRADE CARBON Each carbon filter features premium-grade Australian Virgin charcoal bed rated at 1200+ IAV. It achieves a 38mm charcoal bed thickness and wider mesh openings thanks to a higher microporosity and surface area rating. This combination not only enables a higher adsorption rate without restricting free airflow, it allows the carbon filter to last up to 33% longer.