Description: Sunshine Gardenhouses feature a natural redwood greenhouse frame with plenty of headroom at the peak. Each greenhouse kit features twin wall polycarbonate and includes multiple vents with automatic vent openers that require no electricity or batteries. Each Sunshine Gardenhouse style includes dutch doors and a base made with recycled plastic. The door is pre-hung and the panels are pre-assembled for easy greenhouse construction. With up to four optional greenhouse benches, you can optimize your space no matter what you want to grow. All Sunshine Gardenhouse models can be extended later by four feet with an extension kit. Includes easy to follow printed instructions, clearly labeled panels, and an assembly video. Specification: Dimension:Width = 8' Length = 12' or 16' Height = 10' Door width = 28" Door height = 78" Complete frame: Rugged redwood frame - insect and fungus resistant and acts as a natural insulator Glazing :4mm twinwall polycarbonate covering Vent :2 roof and 2 base vents with automatic openers Door :(1) lockable hinged dutch door Strength All Sunshine Gardenhouses are made with virtually indestructible polycarbonate. Twin wall construction provides insulation and diffuses sunlight so that the interior receives even lighting. Reliability Precision engineered heating, cooling & irrigation systems are available which require no electrical power. Don't lose your valuable plants during a power outage! Easy to Assemble Modular Structure The wood frame and polycarbonate panels are shipped in pre-assembled sections enabling this structure to be assembled in just a few hours. Easy to understand step by step assembly instructions and informative video are included with every structure. Best of all, a 6' ladder, tape measure and power drill are the only tools needed for assembly - even the door is pre-hung!