Air Filter

Introduction of Air Filters

Devices that can purify the air by filtering impurities when the air pass through are called air filters. They can be used at homes, in industrial uses, and on automobiles. In other words, they are widely used in our ordinary life.

This device is basically composed of fibrous, or porous materials which removes solid particulates such as dust, pollen, mold, and bacteria from the air.

Moreover, some of them are designed with adsorbent or catalyst like charcoal (carbon). Through the help of these two elements, air filters would have the ability to remove odors and gaseous pollutants such as volatile organic compounds or ozone.

Since the types of air filters are various and the places need clear air are many, air filters are applied in many industries or places.

In general, where the air quality should be high and clear, the air filters would be.


Elements and Techniques of Air Filters

There are some elements and techniques that air filters use to filtering impurities.

First, the three elements below are mainly used in human-made environments like buildings, satellites, and space shuttles.
● Foam
● Pleated Paper
● Spun Fiberglass Filter Elements
Moreover, air intakes of internal combustion engines and air compressors also use these elements for air filtering.

Below are samples of different types of air filters.
● Air Ionizers
This kind of air filters deal with impurities by the using of fibers or elements with a static electric charge. By these fibers or elements, the impurities would be caught while passing through the filter. Thus, the air would be purified.

● Oil Bath Filters
This kind of air filter was the dominant filter on the automobile parts market before the cotton gauze air filters soaked in oil started to be used.

Oil bath filters remove impurities in the air by running it over oil and a mesh element. It is useful but hard to be cleaned.

Therefore, due to the inconvenience, this kind of air filters gradually went out of the market. Now, only very specific market would choose oil bath filters to use.

● High Efficiency Particulate Arrester (HEPA)
This is one kind of air filters standard. Air filters reach this standard are able to clear the air in high efficiency and reach a high cleaning standard.

It can be used in many applications, including use in clean rooms for IC fabrication, medical facilities, automobiles, aircraft and homes, etc. In conclusion, places that need pure air would require air filters reach HEPA standard.

Conditions of being recognized as a HEPA air filter are various. Among all the conditions, these two are the mostly mentioned.
1. Capable to remove at least 99.95% (European Standard) or 99.97% (ASME, U.S. DOE) of particles whose diameter is equal to 0.3 μm.
2. Capable to increase the filtration efficiency for particle diameters both less than and greater than 0.3 μm.


Air Filters on Automobiles

Basically, there are two main types of air filters would be used in automobiles.

One is for protecting the engine cabin which is called automobile air filter. The other one takes care of the environment air inside the cars.

Below are the two filters.
● Automobile Air Filter
As we know, air and gasoline are necessary for the engine to work. Through the burning of these two, the engine can generate enough energy to make the cars move.

Basically, it should not be any impurities inside the engine cabin because these little things would bring bad effects to the health of engine.

Thus, inside every car and truck, this mushroom-shaped air filters would be installed as one of the necessary engine parts to keep the air goes into engine cabin contains the minimum or even without impurities.

Thus, the air filters can keep engines work with the function they should have.

Below are types of automobile air filter:
1. Paper Filtering
This kind of air filter uses pleated paper to filter the air goes into the engine. Since the element is efficient, easy to service, and cost-effective, air filters made with this technique is popular in tuning market and automobile aftermarket.

2. Foam
This kind of air filter was used mostly on lawnmowers and other power equipment. Nowadays, not only the tools above, air filters made of foam can also be found on air compressors. 

Moreover, they are popular in off-road rallying and other motorsport applications that high levels of dust will be encountered.

Below are also elements that can be used on air filters.
 - Cotton
 - Stainless Steel
 - Oil bath
 - Water bath

● Air Cabin Filter
This is another design of air filter used for keeping air inside the car clean. This kind of air filters are designed like a square plate with filtering devices on it.

By the technique used nowadays, cars generating oxygen by itself is not possible to achieve yet. Therefore, air flow inside the cabin all comes from the outside of cars.

However, it is possible that dirty air flow in a hermetic space would damage our respiratory system, especially environmental air on the road is mostly consisted of exhausted air from other cars.

For solving this problem, air cabin filters are installed on cars to protect the drivers and passengers.

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