German
French
Italian
Portuguese
Japanese
Korrean
Russian
How does Ultra-HEPA Air Filter (ULPA) differ from HEPA?
How does Ultra-HEPA Air Filter (ULPA) differ from HEPA?Super HEPA air filter (ULPA) and HEPA air filter (HEPA) filtration principle has similarities, but there are also some differences, the following is a specific introduction:Same filtering mechanism Inertial collision: When the particles in the air move with the airflow, the larger particles cannot follow the airflow around the filter fiber in time due to their large inertia, so they directly hit the fiber surface and are captured. For example, in ventilation systems, larger particles, such as dust, are easily intercepted by filters due to inertial collisions. Interception: Even if the particles are small, when they flow along the channel between the filter fibers with the airflow if the diameter of the particles is larger than the gap between the fibers, they will be directly intercepted by the fibers. Diffusion effect: For smaller particles, due to their continuous irregular Brownian motion in the air, they are more likely to collide with the filter fiber and be adsorbed and captured. difference Fiber density and pore size: The fiber density of the HEPA filter is relatively low, the pore size between the fibers is relatively large, generally can effectively filter particles with a particle size of 0.3 microns and above, and the filtration efficiency of 0.3-micron particles can reach 99.97%. The ULPA filter uses a higher-density fiber material, and the pores between the fibers are smaller and finer, which can capture smaller particles, such as 0.12 microns or even smaller particles, and the filtration efficiency of 0.12-micron particles can be as high as 99.999%. Degree of electrostatic adsorption: Some HEPA filters contain static electricity, which enhances the capture ability of particles through electrostatic adsorption, and this electrostatic adsorption has a significant improvement in its filtration effect. Although the ULPA filter may also have an electrostatic adsorption phenomenon, because it mainly relies on the fine structure of the fiber and the physical filtration mechanism to filter the very small particles, the electrostatic adsorption is relatively less prominent than the HEPA filter. Breaking mechanism for specific hard-to-catch particles: ULPA filters can sometimes also break particles by allowing them to come into contact with fibers, thus trapping them, this mechanism is particularly suitable for some small particles that are difficult to capture by other mechanisms, such as viruses, but HEPA filters generally do not have this mechanism. |
