How can different filters perform?

I. High-efficiency filter

Can remove pollution particles smaller than 1 micron, installed at the end of the purification system, that is, high-efficiency air supply, the filter material is mostly ultra-fine glass fiber paper, the effect of filtration in more than 99.97%, characterized by high efficiency and resistance.

II. Sub-high efficiency filter

Mainly used to remove pollution particles smaller than 5 microns, the filter material is usually made of glass fiber.

III. Medium efficiency filter

Can remove 1 - 10 microns of pollution particles, generally set in high-efficiency filtration equipment before, used to protect the high-efficiency equipment, the use of more is the bag type medium efficiency filter.

IV. Primary filter

Mainly used to remove pollution particles larger than 10 microns, suitable for new air filtration systems, the whole system plays a protective role, the equipment used in the filter material can be cleaned and regenerated after use.


Evaluation criteria of the equipment

I. Air volume

It is common to evaluate the airflow through the filter, the formula is m³/h = filter cross-sectional air velocity (m/s) x filter cross-sectional area (m²) x 3600.

II. Filtration efficiency

The difference between the dust concentration N1, N2, and the percentage of dust concentration in the air before and after the filtering equipment at the rated air volume is called the filtering power A.
It is more intuitive to use the penetration rate to evaluate the final effect of the filter, the penetration rate K refers to the percentage of dust concentration in the air after filtration and before filtration, the K value clearly reflects the dust content of the air after filtration and also expresses the effect of filtration.

III. Operating resistance

The resistance encountered when the air passes through the filter is also the running resistance, and this resistance will increase with the speed of the filter, and will also increase with the increase in dust capacity.
The resistance at the beginning of the filter is called the initial resistance, and when it reaches a large value, it is called the final resistance, and generally the final resistance is twice the initial resistance.

IV. Dust capacity

This refers to the amount of dust accumulated inside the filter when the final resistance is reached under the rated air volume.
The dust particles in the air often appear as carriers of bacteria, so we can also say that more dust particles in the air also means more contact with bacteria, so the more bacteria in the air, so you want to really remove bacteria or mainly rely on effective air filtration.
And to reduce the concentration of dust in the air, we need the equipment to have sufficient ventilation and airflow in the room to be as even as possible, so that when the airflow flows towards the return air outlet, the dust in the air can be effectively taken away.