AC Infinity Duct Carbon Filter 10" with Australian Charcoal10 Inline Carbon Filter for Grow Room & Hydroponic Ventilation Available at Holland Horticulture, this 10 inline carbon filter is designed to prevent odours and airborne chemicals from escaping hydroponic grow tents and indoor grow rooms. Built for high airflow ventilation systems, it delivers powerful odour control while maintaining excellent air movement for a stable growing environment. Key Features High capacity airflow performance up to 1249 CFM