system doors and windows is a set of perfect qualified evaluation system. It includes the door and window system technical evaluation and system door and window product certification, which can be used for the management of the door and window industry.

First of all, the third-party testing and certification agency will test and evaluate whether a series of door and window systems developed by the door and window system provider reach the promised performance indicators. The samples tested are not doors and windows of normal standard size, but the limit size doors and windows, the limit size opening fan and the heaviest glass, I .e. the most unfavorable sample doors and windows of the series of door and window systems, the technical data for evaluation is all the data that can describe the materials, structure, window type door and window form and technology of the door and window system.

After passing the technical evaluation, the third-party certification body will issue the technical evaluation certificate of the door and window system containing the description of the series of door and window systems; and the certification mode of the system door and window product quality certification is to adopt the type test initial factory inspection and supervision after obtaining the certificate, door and window products that have passed the system door and window product certification will receive the system door and window product certification certificate issued by the third-party certification body and the system door and window product certification mark affixed to the door and window products. Consumers can obtain reassuring door and window products by purchasing products containing performance index certification marks.

system doors and windows are also an innovative business model. It is a business model in which the door and window system provider leads and controls, takes the door and window system as the top-level design, participates in many enterprises, shares the data of the door and window system, and realizes the customization of the door and window products of the system building. Door and window system providers usually use Internet information technology to make profits together with door and window factories and sales distributors through brand, technology and material services, such as the business models of system suppliers-door and window factories-developers in the door and window market for new construction projects, and door and window system suppliers-door and window manufacturers-distributors-stores-owners in the door and window renovation market for existing buildings. Technical Features of Doors and Windows of

3. System

China has a vast territory, a wide latitude span, a large distance from the sea, and different terrain levels, terrain types and mountain ranges. Therefore, the combination of temperature and precipitation is diverse, forming a variety of climates. This has different requirements for the performance of building doors and windows. The northern part is located in the alpine region and the climate is cold, which requires doors and windows to have good thermal insulation performance. The southern tropical climate has a large annual rainfall and is often accompanied by typhoon landing, which requires doors and windows to have good air tightness, water tightness and wind pressure resistance. However, in the middle of the Yangtze River basin, the air humidity is high during the plum rains season, requiring doors and windows to have good water tightness.

As a system door and window, it is based on the performance of the door and window in the research and development stage. From research and development to trial production of doors and windows, inspection of doors and windows, and research and development of doors and windows, a closed-loop research and development process is formed. The produced doors and windows must meet the established performance requirements of the system.

Water tightness performance is one of the key performance of doors and windows. We often see in the news reports, a heavy rain, building doors and windows a lot of water leakage, indoor decoration all flooding phenomenon. Therefore, improving the water tightness of doors and windows is the primary consideration in the design of doors and windows. When designing the drainage structure of the system doors and windows, the most important thing is the principle of isobaric design. The pressure of the watertight cavity and the outdoor atmosphere are equal, so as to ensure that the rainwater entering the doors and windows can be discharged smoothly outside. No matter how bad the outdoor environment is, rainstorm or typhoon, the gas pressure of the airtight cavity of the doors and windows is always the same as that of the outdoor, and the phenomenon of rainwater backflow will not occur, thus ensuring the watertight performance of the doors and windows from the fundamental principle.

In addition, improving the water tightness of doors and windows cannot be achieved by blocking water alone. Conventional doors and windows, often rely on the inside and outside of the glass to play a waterproof role. However, there are many uncontrollable factors in gluing construction. The level of gluing workers will directly affect the quality of sealant construction, and there may be hidden dangers in construction quality and the possibility of water leakage. The sealant itself also has the phenomenon of thermal expansion and contraction. In the process of cold and hot temperature change in winter and summer, the rubber seam of the sealing position of doors and windows is easy to crack, resulting in water leakage. The quality of the sealant on the market is also uneven, the aging time is too short, and some sealants will fail after a few years of use and lose their ability to deform. The drainage design concept of

system doors and windows is "hydrophobic" as the core. No matter how good the sealing measures are, they cannot absolutely isolate rainwater. The design of system doors and windows is based on the principle of equal pressure, and considers the possibility of various water inflow channels. In various possible water leakage cases, drainage channels are set up. For example, when designing the drainage of sliding windows, it is necessary to consider not only the drainage channel of indoor condensate water, but also the amount of water received by indoor fans and outdoor fans to reasonably consider the setting of drainage channels to ensure that rainwater can be discharged outdoors in time.