The Common Types of HVAC Filters

In few of our last posts, we discussed about the HVAC filters importance and their applications. We also talked about that HVAC filters should be replaced with new filters after every two months for ensuring optimal efficiency and high indoor air quality.

Selecting the right type of HVAC filters might be difficult; however, it becomes easy if you follow the standards made by the American Society of Heating, Refrigerating and Air Conditioning, regarding the efficiency standards for the indoor air quality. These standards are based on a rating system termed as minimum efficiency reporting value (MERV), whereas scale ranges from 1 to 16, with an inefficient HVAC filter has the lowest rating and the most efficiency one has the highest. Following are four key types based on mentioned standards.

Washable HVAC filters are found on the lower end of the price spectrum. This type is not the best option for most of the residential systems. Washable filters are vulnerable to collecting fungus, bacteria, other microorganisms that could possibly escape and get into the air. These HVAC filters have a MERV rating of 1 to 4.

Although the fiberglass HVAC filters are good for AC unit as they prevent it from damaging particles, they do not enhance the indoor air quality. If air quality is to be improved, avoid this type, particularly if any of your family members is suffering from allergies. Fiberglass HVAC filters are the cheapest type, but they must be changed frequently. This kind is usually between 1 to 4 on the MERV scale.

Polyester and pleated HVAC filters are more relatively effective at capturing the particles than fiberglass. This kind removes approximately 45 percent of contaminants in the home. Pleated filters trap more airborne particles while maintaining the required air conditioner’s airflow. They are also relatively cheap. Polyester and pleated HVAC filters hold a rating between 8 to 13 on the MERV scale.

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