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The efficiency and characteristics of F9 medium efficiency bag air filter

2022-07-18 Page view : 110 views

Medium efficiency filters are F series filters among air filters. F series medium efficiency air filters are divided into two types: bag type and non-bag type, including F5, F6, F7, F8, F9, and non-bag type, including FB (plate type medium efficiency filter), FS (partition type medium efficiency filter), FV (combined medium efficiency filter).


Material Selection

The outer frame is made of high-quality galvanized steel or aluminum profile, and the material can be customized according to customer requirements.


The filtration principle of SFFILTECH F9 medium efficiency bag air filter:

1.) Interception Airborne dust particles, with the airflow for inertial motion or irregular Brownian motion or by the action of some field force and move, when the particle movement hit other objects, the existence of van der Waals forces between objects so that the particles stick to the surface of the fiber. The dust entering the filter media has more chances of hitting the media, and hitting the media will be stuck. Smaller dust colliding with each other will bond to each other to form larger particles and settle, and the concentration of particles of dust in the air is relatively stable. The fading of interior and walls is because of this reason. It is wrong to treat the fiber filter like a sieve.

2.) F9 medium efficiency bag air filter, Inertia and diffusion Particle dust in the airflow for inertial motion, when encountering the arrangement of disordered fibers, the airflow change direction, particles due to inertia deviated from the direction, hit the fiber and be bonded. The larger the particle the easier it is to hit, the better the effect. Small particles of dust for irregular Brownian motion. The smaller the particle, the more violent the irregular motion, the more chance to hit the obstacle, and the better the filtration effect will be. Air particles less than 0.1 micron mainly for Brownian motion, small particles, good filtration effect. Particles larger than 0.3 microns mainly for inertial motion, the larger the particles, the higher the efficiency. Diffusion and inertia are not obvious particles are the most difficult to filter out. When measuring the performance of high efficiency filters, people often specify the most difficult to measure the dust efficiency value.

3.) F9 medium efficiency bag air filter, Electrostatic effect for some reason, fibers and particles may be charged, producing an electrostatic effect. The filtering effect of electrostatically charged filter materials can be significantly improved. The reason: static electricity makes the dust change its trajectory and hit obstacles, and static electricity makes the dust stick more firmly on the media. Materials that can carry static electricity for a long time are also called “electret” materials. When the material is electrostatically charged, the resistance remains the same and the filtration effect is significantly improved. Static electricity does not play a decisive role in the filtering effect, but only plays an auxiliary role.


Product features of SFFILTECH F9 medium efficiency bag air filter.

1.) Large dust holding capacity.

2.) Small resistance, large air volume.

3.) Easy installation of the product.

4.) The color is light yellow and white.



1.) Trap 1-5um particles of dust and various suspended matters.

2.) Adopt hot melt process, stable structure, reduce the risk of breakage and leakage.

3.) Large air volume.

4.) Low resistance.

5.) High dust holding capacity.

6.) Can be used repeatedly for cleaning.

7.) Type: frameless type and framed bag type.

8.) Filter material: special non-woven or glass fiber.

9.) Efficiency: 60%~95%@1~5um (colorimetric method).

10.) Maximum temperature and humidity for use: 80℃, 80%.


SFFILTECH is a professional F9 medium efficiency bag air filter wholesaler. F9 medium-effect bag air filter, the outer frame is high-quality galvanized frame or aluminum alloy frame. F9 medium-effect bag air filter material is glass fiber, non-woven fabric. It adopts ultrasonic stitching technology, internal drawing technology, etc. The F9 medium efficiency bag air filter we offer is produced with materials that meet international standards. It is suitable for intermediate filtration in pharmaceutical, electronic, food, hospital, cosmetic, semiconductor, precision machinery, automotive and other industries.