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Air Filters

Air filters are devices used to remove airborne particles, pollutants, and microorganisms hazardous to health and the ecosystem. In industrial facilities, air filters preserve the quality of products and materials and protect critical equipment from damage. Cleanroom environments are heavily dependent on air filters to control particle count. Exhaust and stack gases are filtered and cleaned before releasing them into the atmosphere. Air filters are found in many homes, offices, commercial spaces, laboratories, clinics, and hospitals.


Air filters effectively remove dust, dirt, smoke, aerosols, odors, viruses, molds, bacteria, toxic gases, and other particles and pollutants that could exist in ambient air. These pollutants cause and aggravate respiratory illnesses, skin disorders, allergies, and other illnesses.


Air filters work by drawing unclean surrounding air to pass through their filter medium with fine openings. The unwanted particles larger than those openings are trapped inside the filter medium and are separated from the passing air. The air leaves the filter with significantly reduced particle content. Air filters increase their filtration efficiency as particles form a layer in the upstream side of the filter media; this aids in screening other particles. The filter medium is replaced regularly (or cleaned) to prevent it from clogging or blinding and restricting airflow.


Pleated air filters have folds or pleats that increase the filtration surface area. They are contained in a frame or a cartridge that maintains the pleated form of the filter.


Pleated air filters are effective at capturing small and microscopic particles. They generally have high filtration efficiencies and greatly improve indoor air quality as they can capture microscopic pollutants such as odor, bacteria, pollen grains, molds, and other allergens.


Pliable materials such as paper, polyester, cloth, and cotton are used to manufacture pleated air filters. However, due to their material density, they tend to restrict airflow. This causes the motor of an HVAC unit or air filter equipment to work harder to push the air out of the filter medium; this consequently results in higher energy consumption. Pleated air filters are also more expensive than non-pleated air filters. HVAC units must be modified to enable use of pleated air filters.

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