Has 2 screened doors and 8 screened vent openings which allow for optimum air circulation. With the vents open, outside air circulates throughout the greenhouse to prepare plants for planting in outdoor conditions. With the vents closed, the 100% waterproof Gro-Tec material will promote and maintain high humidity levels desirable for a superior growing environment. The Gro-Tec material is UV resistant with rip stop protection for longer life of your greenhouse. Features a unique, zip-together design. You can zip one structure to another infinitely. The outer walls form partitions between each greenhouse so you can create diverse growing environments to suit your needs. You can never outgrow your DreamHouse!