Grow Tent – 4’x4’x6.5′ Grow Tent Grow LED – FC-E4800 LED Grow Light Ventilation Kit – 6” Inline Fan & 6” Carbon Filter Combo Mars Hydro 4×4 grow tent kits include everything you need to start a new indoor grow system: grow tent, LED grow lights, ventilation, filtration, tubing, planters, and other useful tools.