AC Infinity 4" Refillable Carbon Filter Kit with Extra Refill — Reusable Charcoal Air Scrubber for 4" Inline Fan & Ducting (Grow Tent / Grow Room Hydroponics)

AC Infinity’s patented refill system removes the need to replace the entire filter housing by allowing only the media to be changed. The kit ships with a 1+ refill that matches the filtration capacity of two standard 4” carbon filters while costing less. Removable twist-off flanges enable tool-free refilling, and a funnel plus scoop are included to make media replacement quick and clean. The enlarged chamber is lab-tested to block odors as effectively as standard filters, with no compression required. Built with dual-layered steel mesh and a protective coating, the unit resists the high humidity found in grow tents and is designed to last through many grow cycles.You may also like AC Infinity Air Filtration PRO Kit 6” — AI Controller with WiFi App & Auto Level Adjusting, 6” Inline Fan (402 CFM, 32 dBa), Australian Carbon Filter, Flexible Ducting.