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Greenhouse/Polyhouse Designs. 1. GREENHOUSE TYPES, DESIGN AND PRECAUTIONS Dr RK Gupta Professor Department of Agricultural Engineering CSK HPKV Palampur; 2. is one of the most important aspects of poly-house design. The height of structure directly impacts natural ventilation, stability of the internal environment Specially designed Dutch type and Spanish trellising system to support the crop in the structure ranging from 20 to 30 kg/sqm. • Scope of addressing the structures vary in their shape, design, height and size. cost of establishing such naturally ventilated polyhouse unit ranges between Rs. 900–1000 perA. Technical specifications for naturally ventilated Poly House. ** Products with BIS standards only structure is designed to be enough to with stand. ideal for seed propagation, plant growing and display available in elegant and attractive designs with different shapes & size. Shade house Shadehouses are used