LongYoung Greenhouse Company Limited 1. Structure: All hot galvanized,anti rust for 15 to20 years,Strong,1-arch per Bay; 2. Covering material: 4mm or 5mm temper glass;Hi-transmittance; 3. Ventination: Manual or Auto Optional;Side or Roof Optional; 4. Specail for professional planting.Professional Assembly required. Remarks: OEM Structure is available for all greenhouse; Shading,Cooling, Heating, Controlling, Planting Bench and Irrigation system optional.