30' x 50' Commercial Tunnel Greenhouse with 6 Mil Clear Poly Covers and Roll-Up Sides TMG-GH3050-V2 (Previously GH3050)The TMG GH3050 V2 Commercial Tunnel Greenhouse is a sleek, professional, year round growing structure perfect for any type of grower. An EVA clear poly cover protects your sprouts, seedlings and flowers from the elements while still allowing direct sunlight to diffuse through for warmth and optimal growing conditions. This greenhouse is built with a rust resistant and corrosion free galvanized steel frame, creating a strong, stable and long lasting