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What Are the Different Types of Air Filters?


As tighter construction requirements have been instituted in order to increase the efficiency of HVAC systems, indoor air quality (IAQ) has decreased as a result. Due to this, the air-filtration industry has seen a huge boost, and for good reason. The most important factor to keep in mind about air filtration is that the air filter which comes standard with your heating or cooling system is not designed to protect your indoor air. It’s instead designed to protect the interior components of your HVAC system.

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Therefore, you want to invest in an air filter with optimal efficiency. According to recent IAQ standards, the American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) has been promoting the use of the MERV (minimum efficiency reporting value) system to standardize the definition of efficiency.

This system assigns a number based on the filter’s capability to remove potentially harmful particles and allergens from the air. Different types of filters will have varied MERV ratings, in addition to different purposes. Keep reading to learn more about these different types.

Fiberglass: This is a throwaway air filter, and the kind of air filter most commonly used in homes today. It consists of layered fiberglass fibers laid over each other to form the filter media, generally reinforced with a metal grating.

Polyester or Pleated: These types of air filters are somewhat like fiberglass filters, however they usually have a higher resistance to airflow, plus a better dust-stopping ability.

High Efficiency Particulate Arrestance (HEPA): These air filters are able to filter the air passing through them at a very fine scale. When combined with the right air filtration device, these filters are so efficient that they are trusted in most commercial settings—even some hospitals.

Washable: This type of air filter relies on the buildup of dust along the cloth to improve the efficiency of the air filter. They are not as common as other filter types and are typically best for commercial, industrial use.

To learn more about quality air filtration systems in Westchase, FL, contact IERNA’s Heating & Cooling today.