Exploring the Testing Methods for FFU Filtration Efficiency
2024.08.09
In the current pursuit of high-quality air environments, the filtration efficiency of FFU (Fan Filter Unit) has become a key indicator. Understanding and accurately testing the filtration efficiency of FFU is crucial for ensuring the air quality in production environments, medical facilities, laboratories, and other places.
The common testing methods for FFU filtration efficiency mainly include the following:
Gravimetric Method: This is a method of calculating the filtration efficiency by measuring the weight of particulate matter in the air before and after filtration. First, collect a certain volume of dusty air, let it pass through the FFU filter, and then measure the weight of particulate matter before and after filtration respectively. The filtration efficiency is obtained by the ratio of the weight difference to the initial weight. For example, in a specific experimental environment, let the air containing dust of a specific weight pass through the FFU, and measure the change in the weight of the dust before and after to calculate the filtration efficiency.
Particle Counting Method: Use a particle counter to count the number of particulate matter in the air before and after filtration. This method can more accurately reflect the filtration effect of FFU on particulate matter of different particle sizes. In a cleanroom environment, the number of particles in different particle size ranges before and after filtration is recorded respectively by a particle counter to calculate the corresponding filtration efficiency.
Colorimetric Method: Based on the principle of scattering and absorption of light by particulate matter. After letting the dusty air pass through the FFU, compare the transmittance or scattering degree of light before and after filtration to determine the filtration efficiency.
Oil Mist Method: Particularly suitable for testing high-efficiency filters. Introduce oil mist into the airflow, and after filtration by FFU, observe the concentration of oil mist downstream to evaluate the filtration efficiency.
When conducting FFU filtration efficiency tests, it is necessary to strictly control the test conditions, including air flow rate, temperature, humidity, etc., to ensure the accuracy and reliability of the test results. At the same time, the selection of an appropriate test method should be determined based on the specific application scenarios and requirements.
Accurate FFU filtration efficiency testing not only helps us choose the appropriate FFU equipment but also provides strong data support for optimizing the air purification system, creating a cleaner and healthier air environment for us.
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