Greenfingers 4"Ventilation Kit Fan Hydroponics Grow Tent Kit Carbon Filter Duct,Greenfingers 4"Ventilation Kit Fan Hydroponics Grow Tent Kit Carbon Filter Duct4" Hydroponics Grow Tent Ventilation Kit Vent Fan Carbon Filter Duct Ducting Here is all you need to get your hydroponic greens growing healthily with the best of conditions. With the Green Fingers 4" Hydroponic Grow Tent Ventilation Kit. Comprising a 4" Ventilation Fan, 4" Active Carbon Filter and 5m Aluminium Ducting, the Ventilation Kit is designed to provide pure and clean air for your plants at all times. The Fan features high impact