What testing method is used to best determine filter efficiency?

The independent laboratory ANSI/ASHRAE 52.2 test is the most recognized method for determining filter efficiency. This standardized procedure provides a reliable and repeatable measure of a filter's performance across various particle sizes and types. By employing a controlled environment, the test can accurately quantify the ability of the filter to capture particles, generating data that is vital for understanding and comparing the efficiency of different filter products.

The robustness of this method stems from its acceptance within the industry, enabling manufacturers to report performance metrics that are grounded in scientific research. As a result, users can make informed decisions based on standardized efficiency ratings, leading to better air quality outcomes.

Field tests with customer input can offer valuable insights but often lack the rigor and standardization needed for comparative analysis. Visual inspections by experts provide qualitative feedback but do not yield quantitative efficiency metrics. Home-made testing equipment may not adhere to any recognized standards, leading to inconsistent and unreliable results. Thus, the ANSI/ASHRAE 52.2 method stands out as the most effective means of determining filter efficiency objectively.