Air filters are designed by air filter manufacturers to remove a range of contaminants from the air, including molds, gases, dirt and odors. There are specific air cleaner filters available for different needs, for not all filters are designed to remove the same particles. Filter efficiency is determined by a few different factors: the size of the filter fibers, the density of the fibers in the filter and the velocity of the air that moves through the filter.
Air filters are devices used to minimize or remove unwanted particulates from the air flow within a ventilation system or space to improve air quality and to extend the working life of machinery, engines and appliances. Filters are typically composed of a fibrous material which is constructed in a screen through which air is moved. Air filter manufacturers design air cleaner filters for different needs and filtration standards. The particles to be removed from the air can range from dust to pollen to mold spores to animal dander and other unwanted molecules carried by air. Types of filters include inline filters, membrane filters, air compressor filters, HVAC filters and more which are simply constructed devices incorporated into a wide variety of everyday applications. Specialty filters such as carbon air filters or exhaust filters can be used to remove other contaminants such as gases and odors from air streams. In medical applications, filters can be used to remove bacterial and viral microbes and infections which are transported through air molecules. HEPA air filters and ULPA filters provide the highest level of filtration, while other filters such as foam filters or vacuum filters provide lower levels of air purification but are perfectly adequate filters for many applications. Electrostatic filters provide an almost permanent filtration screen solution and do not require a power source in order to be most effective. Most types of filters can be custom fabricated to an extent in order to meet specific requirements.
In addition to these uses, the automobile industry uses air filters extensively in vehicles to help promote engine hygiene. Exhaust filters and inline filter are common engine components. Some domestic and industrial appliances house their own internal air filters to increase air quality. Clean air within individual machines ensures longer life to the units. Examples of these types of air filters are found in vacuum cleaners and humidifiers. Air filter manufacturers create their products to protect machines like cars and air conditioners from damage and premature breakdown. Air compressor filters, for example, are vital to the longevity of direct air machines such as nail guns. For the most part, air filters that deal with large particles and high velocities have large filter fibers, and likewise, air filters that deal with small particles and low velocities have small filter fibers. To ensure that an air filter will work properly in its intended application, make sure that the design, density of media and fibers and possible adhesive are taken into account before purchase. Air filters are generally able to function very well, as long as they handle the right kind of particulate for their design. If well maintained and regularly cleaned, many filters will outlast their intended replacement date and will provide years of reliable performance and cleaner air.
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The retention of gas, liquid or solid on a surface due to positive interaction/attraction
between the surface and the molecules of the adsorbed material.
- A term that refers to any particles or substances floating in the air.
- A current of air.
- A normal substance that causes an acute defensive reaction in a person's immune system.
- An air filter's ability to remove synthetic dust from the air during a test.
- A backward surge of pressure from downstream to upstream of an air filter. Backpressure can be the result of closing a valve or air entrapped in a liquid system.
- International professional designation available through training and testing by the Association of Energy Engineers (AEE).
- Family of chemicals used as refrigerants, being tightly regulated and phased out of production due to stratospheric ozone depletion potential. Examples: R-11, R-12, R-113, R-114, R-115.
- The prevention of an agent from being transmitted from one point to another.
- An unwanted intrusion, such as harmful airborne particles.
- The removal of unwanted airborne particles to neutralize the air.
- The permeable material that removes particles from a substance being filtered.
- Particles passing through an air filter without being removed from the air stream.
- The product that is filtered.
- A term that refers to the amount of pollutants in the air within a confined space.
- A filament, grid or porous body in an ion engine or other device that strips an electron from the outer shell of a neutral atom to form a positively charged ion.
- A continuous matrix with pores of defined size.
- Pressure in an area that is responsible for the inflow of air.
- A molecule containing three atoms of oxygen. Ozone is harmful to both humans and plants at ground level, but is crucial in blocking ultraviolet radiation in the stratosphere.
- A very small solid suspended in air or water that can vary in size, shape, density and electrical charge.
- Pressure in an area that is responsible for the outflow of air.
- In the case of air filters, a measure of the resistance of air to flow through a filter.
- The direction that is in opposition to the airflow.