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How to choose the right explosion-proof FFU?
How to choose the right explosion-proof FFU?Choosing your own explosion-proof FFU needs to consider several factors, the following are the specific points:Explosion-proof correlation Explosion-proof grade: According to the type and danger degree of flammable and explosive substances in the place of use, choose the corresponding explosion-proof grade of FFU. For example, in environments containing gases such as methane, explosion-proof FFUs such as Ex d IIA T4 may be required; In places with more dangerous gases such as hydrogen, higher grades such as Ex d IIC T6 may be required. Explosion-proof certification: ensure that the selected explosion-proof FFU has the explosion-proof certification issued by the authority, such as the domestic CQC certification, which is an important basis for the product to meet the explosion-proof standards, to ensure the quality and safety of the product. Purification capacity correlation Filtration efficiency: Selected according to the requirements for environmental cleanliness. For example, in places with high cleanliness requirements such as electronic chip manufacturing workshops, it is usually necessary to be equipped with a filtration efficiency of HEPA (high-efficiency air filter) H13 or higher, and its filtration efficiency of 0.3-micron particles can reach 99.97% or more; For some chemical laboratories with relatively low cleanliness requirements, HEPA H10-H12 filters may be selected. Air volume: Calculate the required air volume according to the size of the space used and the number of air changes required. In general, for a clean room with an area of 100 square meters and a height of 3 meters, if 20 air changes are required per hour, the total air volume required is 100×3×20 = 6000 cubic meters/hour. Then according to the room layout and the number of FFUs installed, determine the air volume of each FFU. Static pressure: If the FFU needs to connect a longer pipe or overcome a larger resistance, it is necessary to choose a product with a higher static pressure. For example, in some industrial plants with complex ventilation ducts and high resistance, FFUs with a static pressure of more than 500Pa may be required to ensure that there is enough pressure to transport air to the specified location. Operation is related to maintenance. Noise level: Consider the noise requirements of the site. If it is near a laboratory or office area that is more sensitive to noise, FFU with a lower noise level should be selected, generally not exceeding 50dBA; In some relatively noisy industrial workshops, the noise requirements can be appropriately relaxed. Energy consumption: Pay attention to the power and energy efficiency ratio of FFU, and choose energy-saving products to reduce long-term operating costs. For example, some FFUs using DC brushless motors can reduce energy consumption by 30%-50% compared to FFUs of traditional AC motors. Easy maintenance: Choose an FFU with a reasonable structural design and easy disassembly and assembly to facilitate regular replacement of filters and inspection of components such as fans and motors. For example, some FFUs have a quick-release filter design that eliminates the need to use tools when replacing filters, which greatly improves maintenance efficiency. Other factors Installation method: According to the building structure and space layout of the site, choose the appropriate installation method, such as lifting, seat mounting, or side mounting. If the ceiling height is high and the space is open, the hoisting method may be more suitable; For some corners or near walls with limited space, side-mounted or seat-mounted FFUs may be more convenient to install and use. Brand and after-sales: The priority is to choose brands with good reputations and high visibility in the market, and the products of these brands are usually more guaranteed in terms of quality, performance, and after-sales service. At the same time, it is necessary to understand the after-sales service content of the manufacturer, including the warranty period, maintenance response time, spare parts supply, etc., to ensure that problems encountered in the process of use can be solved in time. |
