The replacement time for HEPA filters in an air shower room depends on various factors. Air shower rooms require high air cleanliness, and they typically have pre-filters and terminal filters. However, the filtering efficiency of any type of air filter will decrease over time and may fail to meet the requirements. Therefore, it is necessary to replace the high-efficiency air filters in the air shower room periodically.
In an air shower room, the replacement frequency of high-efficiency air filters can be determined based on the following factors:
Usage environment: The replacement time of high-efficiency air filters is influenced by the concentration of particles and types of pollutants present in the environment. If the environment has a higher concentration of particles and pollutants, the filters may need to be replaced more frequently.
Filter type: Different types of high-efficiency air filters have different design lifespans. Generally, the design lifespan of high-efficiency air filters ranges from 1 year to 3 years. You can refer to the technical specifications and recommendations provided by the filter manufacturer to determine the replacement time.
Filter pressure drop: The pressure drop across the filter refers to the difference in air pressure between the inlet and outlet. As the filter is used over time, the pressure drop gradually increases. When the pressure drop exceeds a certain threshold, often referred to as the design terminal resistance, it is typically necessary to consider replacing the filter.
Taking into account the above factors, in general, the replacement cycle for high-efficiency air filters in an air shower room can range from 1 year to 3 years. However, the exact replacement time needs to be determined based on specific usage conditions and the performance characteristics of the filters.
Generally, the dedicated pre-filters in an air shower room can be cleaned every 3-6 months, with no more than 3 cleaning cycles. High-efficiency filters, on the other hand, typically need to be replaced around every 2 years. However, these are recommendations provided by air shower room manufacturers for most users. The actual analysis is as follows:
Air shower rooms utilize pressure differential measurement devices to determine whether the filters have reached their designed terminal resistance, which is a good method for determining filter lifespan. Once the filters reach the designed terminal resistance, they must be cleaned or replaced.
Another approach is to determine the filter's lifespan based on experience. For example, high-efficiency filters are usually replaced every 2-3 years under normal usage conditions, but this data can vary significantly. Experience-based data is specific to certain projects and has been validated through the operation of air shower rooms. It can only be used for those specific air shower rooms. If the application is expanded, deviations in lifespan are inevitable.
For instance, high-efficiency filters in air shower rooms for large infusion workshops, solid formulation workshops, sterile testing laboratories, etc., have lifespans of three years or more.
Therefore, the empirical values for filter lifespan cannot be arbitrarily applied across different contexts. If the system design is not reasonable, fresh air treatment is inadequate, or the dust control scheme in the air shower room is not scientifically developed, the filter's lifespan will undoubtedly be shorter, sometimes requiring replacement in less than a year.
As a user of an air shower room, it is crucial to understand the expected lifespan of the accompanying filters.
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