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Liaocheng Flextronics ventilation equipment specializing in the production and operation without power fan and non-powered natural ventilation and so on. Natural ventilation is based on the air thermodynamic principles, by indoor and outdoor thermal pressure, complemented by natural wind, in the case without the need for power-driven continuous indoor air from the outdoors, while the inflow of fresh outdoor air, thereby promoting and improving indoor temperature and humidity conditions. Since this is an energy-saving ventilation, so the "heating, ventilation and air conditioning design specifications" GB50019-2003 the provisions of Article 5.2.1: the elimination of building heat, ventilation design than wet, should give priority to the use of natural ventilation. Liaocheng Flextronics ventilation equipment specializing in the production and operation without power fan and non-powered natural ventilation and so on. The first principle of natural ventilation windows ventilators choice is the choice of the selected type and amount of installed capacity to meet the requirements needed for the ventilation of the room, that meet the needs of the people in the room for the amount of fresh air. Doors and windows, walls natural ventilation as windows and doors, curtain wall supporting a product, its structure and material terms demanding that wind pressure, anti-rain and noise insulation, air tightness and insulation performance requirements and the doors and windows to match, and To achieve the same life with the doors and windows, select ventilation type and number of installations, to consider building their own combination of factors. First, consider the location of the building climate conditions, such as the basic value of wind pressure and temperature conditions. Ventilation different pressure values ??on the same model and length of the obtained amount of ventilation is different, to choose the type ventilation weatherproof performance indicators itself whether to meet the requirements. Temperature aspect to consider whether the cold regions, that is, the type of ventilation through the K value and U value whether for use in the cold season is not condensation. Liaocheng Flextronics ventilation equipment specializing in the production and operation without power fan and non-powered natural ventilation and so on. Roof ventilation, also called roof natural ventilation and roof natural ventilation design and works mainly around the aerodynamic wind load theory "Wind acting on the object, the windward side is the pressure in the dorsal surface wind surface and the wind direction is suction "The expansion, combined with 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 reduce the ventilation body are exposed to wind pressure; (2) the use of ventilation body height and arc shape formed by the large volume, improve the ability to collect and discharge indoor air; (3) Set the boost duct (also drain) gather wind roofing, ventilation is formed from the bottom up pressure thrust, driven poly exhaust hot air upward warehouse; air (4) in any direction across the top of the ventilation outlet is bound to the formation of suction, improve ventilation on the pull speed.