Hvac Filters

Written by Norene Anderson
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HVAC filters serve two basic purposes. First, the filters remove dust and other particles that can collect on the coils of the unit and hamper efficient performance of the heating or cooling unit. Second, the filters remove particulates from the indoor air to provide clean air for inhaling. A more efficient unit will effectively clean the air without placing strain on the system.

HVAC filters should be determined by the major type of pollutants in the air and the health status of the occupants of the home. If allergies are a problem, the allergen needs to be removed. Not all filters are alike. They are rated according to the type and size of pollutants that are captured by the filter media.

Many Types of HVAC Filters

The ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers) has standards for the HVAC industry. All HVAC filters should meet these standards. Filters are made from a variety of materials and in a variety of designs. There are roll filters, polyester filters, pleated filters, and pre-cut pads. Some are flat-panel filters and others are pleated filters.

The pleated filters for HVAC units may be cotton, fiberglass, polyester, synthetic, or paper materials. Non-woven technology has advanced to bring increased performance of synthetics over the poly-cotton blends. These synthetics also have the ability to utilize an electrostatic charge to improve the capture ability of the filter. Maintaining a clean filter is essential to having clean ductwork. It is important to change the filter according to the schedule recommended by the manufacturer.


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