HEPA/ULPA Filter Dust Holding Capacity Test

The Dust Holding Capacity Test of an air filter is a measure of the amount of dust or particulate matter that a filter can hold before it reaches a specified level of pressure drop or resistance to airflow. It is expressed in grams or other appropriate units. This test is important in evaluating the long-term performance of air filters, especially in applications such as HVAC systems, industrial processes, and cleanrooms, where filters are regularly exposed to airborne particulates. Standards organizations such as ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers) and ISO (International Organization for Standardization) provide specific guidelines for conducting dust holding capacity tests on air filters.

• Standards: ISO 29461-1