Manufacturer Name: York Product Number: S1-AA213 OEM Part Number: S1-AA213 Product Description: The York S1-AA213 furnace Media Filter is a high-efficiency filter that is designed to fit perfectly into a 20x25 HVAC system. It has a MERV rating of 13, which means that it is capable of trapping particles as small as 0.3 microns in size. This makes it effective at removing airborne allergens, dust, and other pollutants from the air. It is easy to install and replace. It comes with a pleated design that helps to increase the surface area of the filter, which allows it to trap more particles. The filter is also made from a high-quality material that is durable and long-lasting. Media filters, also known as air cleaner filters, are more efficient than standard fiberglass filters, and the York S1-AA213 is designed to provide superior filtration performance