Nate Core Practice Test

HVAC filter types are classified primarily by their MERV rating (Minimum Efficiency Reporting Value) because this metric provides a standardized way to evaluate the effectiveness of air filters in capturing particles from the air. The MERV rating ranges from 1 to 16, with higher numbers indicating that the filter can capture smaller particles and a greater variety of contaminants, including dust, pollen, pet dander, and other allergens.

This classification is important for understanding the filter's performance in reducing indoor air pollutants and making informed choices about air quality management. The MERV rating helps consumers and professionals select the appropriate filter based on specific air quality needs, considering factors such as health concerns and system compatibility.

While other methods of classification, such as color coding, size, or material, can provide additional information about the filter, the MERV rating is the most universally recognized standard that directly correlates with filter efficiency and effectiveness in various HVAC systems.