AC Infinity’s refillable 4-inch carbon filter kit is designed for odor control in grow tents and indoor gardens. The unit uses reversible aluminum flanges and dual-layer galvanized steel mesh with a protective gunmetal finish. Its carbon bed is filled with Australian virgin RC412 activated charcoal rated 1200+ IAV and ships with an extra refill, plus a funnel and scoop for tool-free reloading. The filter measures 30.0 cm in length with a 4-inch (10 cm) duct opening and is rated up to 210 CFM (about 357 m³/h). Intended for exhaust ventilation, it pairs with 4-inch inline fans so air passes through the carbon before leaving the space, maintaining airflow while scrubbing odors. Total dimensions: 30.0 × 17.9 cm; flange length 4.0 cm.
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