Whitney Educational Greenhouse Kit With 8FT High WallsDescription The Whitney Educational Greenhouse Package is designed for schools with horticulture programs, correctional institutions, and serious gardeners for both growing and therapeutic reasons. The 2 x 2 galvanized steel frame with pre welded stanchions and Commercial graded 8mm twin wall corrugated covering (walls and roof) are the same specifications used in commercial products in the market today. The walls and roof are warranteed for 10 years