An air filter is a device for removing contaminants from an air stream. In the nonwovens industry, air filters are used in a variety of applications such as HVAC systems, air purifiers, and industrial equipment. Air filters can be made from a variety of materials such as fiberglass, polyester, and synthetic fibers. Businesses in the nonwovens industry must ensure that their air filter products have adequate filtration efficiency to meet the demands of their customers.