| Air filters are generally used to remove dust | | | | free of dust to the maximum extent. House air |
| particles and other minute unseen particles like | | | | filters and air purifers can help in this regard. |
| pollens and bacteria from the air. They are mainly | | | | Things like foam, ruffled paper, fiber glasses are |
| used in devices where the purity of air is the | | | | used as air filters. Even fibers and elements that |
| major factor of operation, such as, ventilation | | | | have static electric charge are used as air filters. |
| systems, combustion engines, compressors, | | | | The internal combustion engine uses filters like |
| turbines and the air conditioners. | | | | paper or cotton. |
| The air is required to be pure and without dust in | | | | There are four major types of air filtering medias |
| places like research laboratories where even a | | | | - they are the paper, foam, synthetic and cotton |
| dust of 1ppm or 1 part per million could | | | | fabrics. These filters should be serviced regularly |
| contaminate the environment and would cause a | | | | and the dirt should be removed regularly so that |
| lot of effect in the research recordings. | | | | they work better in the long run. |
| House air filters are very necessary in hospitals | | | | There are also HVAC (Heating, ventilating and air |
| where patients suffering from wheezing and | | | | conditioning) filters available and are manufactured |
| asthma have to be in a very pure environment | | | | using the fiber glass technology. They are very |
| free of dust, else their problem could aggravate. | | | | cost effective and also disposable. There are |
| Even in a house where there are babies or old | | | | Universal Air Filters also known as the UAF that |
| people, care should be taken that they breathe air | | | | are used for filtering the air. |