This kit includes the 20' Conservatory Greenhouse with two Easy-Flow Louver Solar Openers, eight base vents, and two tie-down kits. The tie down kits will be necessary to secure your greenhouse, as the Conservatory Greenhouse does not require a base or foundation. The following items are also recommended to ensure proper ventilation, and can be found in the related items box in the top left column of the website. Place the two louvered windows that are included with your greenhouse high on the walls. To circulate the air place a 20" fan at the back center of your greenhouse. 20' Conservatory Greenhouse The Conservatory Greenhouse is Solexx's most spacious greenhouse. This greenhouse towers at 114" H. It will give life to young seedlings, large plants, and even small trees. A large 60" wide, double tiered bench frame is located in the center for optimum working space. Four hanging rods are available for mounting accessories and hanging plants. You also have the option of using up to four doors. Two 12" H x 24" W Easy-Flow louvered air vents are included with all parts for assembly to get you started with proper ventilation. This greenhouse is lightweight which allows you to place it right over a pre-existing garden. The unit is free standing. You will need no site preparation or special foundation. We do recommend a level ground beneath it. Also included are double walled Solexx paneling. The corrugated plastic is constructed of high density polyethylene for the strength of corrugated cardboard and durability of plastic.