Ventilation and roof natural ventilation design and works mainly around the aerodynamics of wind vector type theory "wind acting on the object, the windward side of the pressure, the dorsal surface of the wind surface and the wind direction for suction" and expanded, combined Structural Mechanics Building, after numerous tests and improvements, the formation of the relatively complete product. Its performance is mainly reflected in: (1), is designed to streamline the overall arc, both to ensure the ventilation body strength, but also effectively reduces the body is exposed ventilation pressure; (2), the use of ventilation body height and a large volume of arc formed, effectively improve the ability to collect and indoor air emissions; (3) to set boost duct (also drain) * Roof wind ventilation is formed from the bottom-up pressure thrust to drive the heat accumulating compartment air discharged upward; (4), the wind from any direction over the top bound of the suction ventilation outlet formed to improve ventilation of the pulling speed. Snow load requirements and structural design roof ventilation design snow load capacity depends on the form of the steel frame, steel frame material specifications, perimeter protection and rain plate thickness factor. For the natural ventilation is suitable for the country, the natural ventilation design is based on the basic snow pressure high value areas in northern China Xinjiang Altay snow pressure region as a reference, and can withstand the region's 30-year return period of meteorological records maximum snow load 0.70 KN / m2. Making snow load bearing structure design, full account of the emergence of snow sliding snow load is not evenly distributed load leads to the most unfavorable conditions, rain panel system designed for large slope herringbone structure, vertical steel purlins using C and purlin spacing parallel controlled within the range of 1500mm. Rain and structural requirements designed to prevent the intrusion of rain and snow is a basic requirement for the roof ventilator. www.lcrxfj.com www.lchttfsb.com www.ruixingtfq.com 18663505583 15506519090 QQ; 772856556