As today engineering and maintenance are increasingly focusing on IAQ and its effects on facilities and residents, filters manufacturers are providing more efficient HVAC filters and systems for air filtration. These technology developments include higher filter efficiency, lesser pressure drops and compact motors and fans, due to the declining pressure drop across the HVAC filters. This article highlights the topmost HVAC filters variations that are heavily being used in a number of industrial and commercial applications.
The Types of HVAC Filters
After the introduction of IAQ standards and regulations by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE)m the air-filtration industry seems to change, adopting the minimum reporting value (MERV) system to standardize the meaning of HVAC filters efficiencies. In this view, following types of HVAC filters have come up in the market.
- Fiberglass Filter
The fiberglass HVAC filter is the most common type of HVAC filters. Layered fiberglass fibers are placed over one another to make a filter media and usually are reinforced with a metal grating that supports the fiberglass to prevent any damage or collapse.
- Polyester & Pleated Filters
These filters are quite similar to the fiberglass filters; however, they usually show more resistance to the airflow and a higher dust-stopping capability.
- High Efficiency Particulate Arrestance (HEPA) Filters
These filters filter the air passing through, on a very minute scale. That is, they filter the particles of size 0.3 microns or larger.
- Washable Air Filters
These products are not very common and based on the accumulation of dust along a cloth to enhance the filter efficiency. Industrial processes having high amounts of coarse dust are the common applications.
Since HVAC filters are very simple- they have porous membranes allowing air to pass through them, small change has happened to rectify the problems relayed to air pressure drop and its effect on energy efficiency.