1.steel structure animal feeding building/steel framing structure/animal farm house 2.environmentally friendly 3.Flexible. 1>Spefication 1. Wide span: single span or multiple spans, the max span clear distance is 36m, without middle columns.2. Low cost: unit price range from USD35 to USD70/square meter FOB according to customer’s request.3. Fast construction and easy in installation4. Long term ...