The Duct Carbon Filter (12-inch) was created to keep the air clean and odorless in grow tents and hydroponic growing configurations. Built with Australian charcoal, it’s highly efficient at absorbing odors from the room while maintaining optimal performance. This filter is also a great choice for eliminating chemical smell from the growing space. Designed with durability in mind, the structure is sturdy, made from strong aluminum flanges and galvanized steel meshing. The 38 mm thick charcoal bed has a high absorption rate, and when used in conjunction with AC Infinity Duct Fans ensure an optimal air passage for a longer time. With a lifespan extended by 33% compared to standard filters, the Duct Carbon Filter is everything and more. The Duct Carbon Filter 12-Inch air filter offers a maximum airflow of up to 1668 CFM. Need less power? Consider the Duct Carbon Filter XL 4-Inch, which offers an air flow of up to 300 CFM. Need even less power? Consider the Duct Carbon Filter 4-Inch, offering up to 210 CFM.