20x20x5 MERV 11 Air Bear Replacement Filter (2 Pack)

The filters are advertised as MERV 11, however; when received the factory mark in the MERV 8 box was covered with a white file label and the MERV 11 was checked with a marker on the other side of the filter.... I paid a premium price for a higher MERV rating.

Just a warning to potential buyers: check the actual (not nominal) dimensions to ensure the filters will fit your furnace. For example, there exist at least two different filter sizes with the nominal dimensions 20x20x5. While the actual dimensions of the filter are listed here, the sellers of these filters (which seems to alternate on any given day between Filters-NOW and furnacefiltersonline.com depending on Amazon's choice) have chosen to only include a warning about the filter sizes in their return policy descriptions. Since I was foolish enough to purchase these filters (actually two 2-packs---durrr) without first consulting the return policy, I was unaware that the nominal 20x20x5 size did not match the size necessary for my furnace (I was replacing a filter with the same nominal dimensions--20x20x5--stamped on the side, so I didn't consider the fact that the actual dimensions might differ).

Unfortunately in my case, Filters-NOW directed me to return these via...Read more