Regular customers often ask, "How long should our air filter last before it needs to be replaced?" One of the key indicators to consider is the final resistance of the filter. When the resistance approaches the recommended value, it's time to evaluate whether the filter needs replacement. Some primary filters can be cleaned and reused, so in such cases, cleaning might be a better option than immediate replacement. This helps maintain optimal filtration performance.
Here are the recommended final resistance values for different types of air filters:
- G3 (Coarse Efficiency): 100–200 Pa
- G4 (Primary Efficiency): 150–250 Pa
- F5–F6 (Medium Efficiency): 250–300 Pa
- F7–F8 (High Efficiency): 300–400 Pa
- F9–H11 (Sub-HEPA): 400–450 Pa
- High and Ultra High Efficiency: 400–600 Pa
Understanding the concept of initial and final resistance is essential. The initial resistance refers to the resistance of a new filter, while the final resistance is the point at which the filter must be replaced due to excessive airflow restriction. This is typically 2 to 4 times the initial resistance, depending on the filter type and application.
The selection of the final resistance affects not only the lifespan of the filter but also the system’s airflow capacity and energy efficiency. If the final resistance is set too high, the filter may become ineffective before reaching that point, leading to reduced airflow and increased energy consumption.
During operation, external factors like dust concentration can significantly impact the filter’s performance. If the filter becomes clogged and isn’t cleaned or replaced in time, it can reduce the overall airflow in the system. As the airflow decreases, the fan may need to work harder, increasing resistance beyond the filter’s limit and potentially causing damage to the filter media.
It’s important to note that the higher the final resistance, the more quickly the filter will reach its limit. Setting it too high doesn’t necessarily extend the filter’s life—it just leads to sudden airflow drops and system inefficiencies. Therefore, choosing an appropriate final resistance is crucial for both performance and longevity.
To ensure accurate monitoring, it’s highly recommended to install a pressure differential sensor in each filter section. The final resistance should be determined by the sensor readings, not just based on operator judgment. Regular monitoring helps prevent unexpected failures and ensures consistent air quality and system performance.
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