Amagabeli 4 inch Carbon Filter Odor Control 4 in Air Scrubber with Australia Virgin Coconut Activated Charcoal for Hydroponics Indoor Plants Grow Tent Room for 4&rdquo; Inline Fan Combo Pre-filter Included Absorbent Carbon Filter: 4 inch carbon filter, 1050+ IAV Australian virgin charcoal bed, machine packed carbon enables 99.8% filtered air flow. Inner and outer mesh provides 55% open area allowing increased air flow. Air Scrubber: Galvanized Steel material more durable than aluminum, lasts long from plants germination, sexing, flowering and harvest. Includes washable pre-filter, easily mount the filter with Velcro seam. Odor Control: Air purifier to eliminate odor, pungent smell and particulates from indoor grow tent, hydroponics grow room, smoking room, living room, bathroom, kitchen, drying rooms, pet house, welding workshop, 3D printer etc. Perfect for tomato plants, pepper, vegetable lettuce, cilantro. Fresh Air Combo: The 4in carbon filter matches with 4 inch inline fans, can fans, duct fans, intake fans, exhaust fans, air exchange fans, ventilation duct, air ducts, paint fumes hose, vent duct hoses, fan speed controller and other ventilation system accessories. Reversible Smell Filtration: The charcoal air filter can be used as both Intake Filter and Exhaust Filter. After a period of time use as an intake filter, go on using it as an exhaust filter. Moving air, purifying air and filtering air.