Whether the air filter can be cleaned

Filter cleaning is generally aimed at primary and intermediate filters, not high-efficiency filters; cleaning is not recommended because, after cleaning, the electrostatic charge completely disappears and the filtration efficiency is low; the cleaning process will change the organizational structure of the filter material and reduce the filtration efficiency; particles remain in the inlet and outlet surfaces after cleaning, increasing the load of the post-filter; and if the cleaning process results in the filter breakage, especially if it is invisible to the eye, it will result in leakage and affect the post-filter. If the cleaning process causes damage to the filter, especially if the damage is not visible to the naked eye, it will cause leakage and affect the post-filter.

Reasons for sudden shortening of filter service life

Normal use of the filter resistance value will not change suddenly, generally caused by changes in the external environment; for example, the increase in the content of particles in the fresh air, such as winter haze, spring pollen and other seasonal reasons; winter, especially in alpine areas, the filter surface has rain and snow accumulation and freezing, resulting in filter clogging; changes in the production process, increase in production frequency, etc., pay more attention to the use of seasonal changes in the process of daily data record Accumulation of daily data records can provide data support for the replacement of filters. 4.

How to judge the air inlet and outlet surfaces

You can't simply rely on the position of the sealing strip to judge. Some sealing strips are on the air inlet side and some on the air outlet side, depending on the installation form of the filter inside the equipment. For liquid tank filters, relying on gel sealing, the gel surface is the air inlet surface. No spacer, spacer type filters, the general side of the frame and the face of the filter surface is flush with the air surface.

Difference between glass fiber (GF) and polytetrafluoroethylene (PTFE)

GF:

Ø Long-term use in clean industry, good filtration effect, stable performance

Large dust capacity, long service life. The super high efficiency in electronics industry can be used for 30 years.

Inorganic materials, low TVOC (Total Volatile Organic Compounds) content

Suitable for aerosol test leakage point

High weight, high resistance value

Not resistant to HF (hydrofluoric acid)

PTFE:

Stretching film, low thickness, need to rely on support layer molding

Low dust capacity, unstable service life

High TVOC (Total Volatile Organic Compounds) content

Not suitable for aerosol testing leakage points (resulting in clogging of membrane holes)

Low resistance value, about half of GF

Good chemical stability, wider range of applications

Application

Air purification treatment generally adopts primary, medium and high efficiency three-stage filtration.

Ø Coarse filter, arranged at the fresh air outlet or the entrance of air-conditioning unit, mainly filtering out large particles ≥5um;

Medium-effect filter, arranged in the positive pressure section of the unit, mainly provides protection for the end of the high-efficiency filter, filtering out particles ≥ 1um;

High-efficiency filter, set in the end air supply outlet of the purified air-conditioning system.

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