Listings give a nominal size of 16 x 28 x 4 inches and an actual size of 15 7/8 x 28 3/4 x 4 1/8 inches. One product overview line also shows an inconsistent summary measurement of 16.0 x 28.0 x 16 inches; treat that overview value as likely erroneous and rely on the nominal and actual dimensions above.
The listings show a MERV 13 rating for Aprilaire 413 replacement filters.
They are described as electrostatic filters made from polypropylene.
Listings show both 1-pack and 4-pack options. The bullets list a package quantity of 1 with Weight: 1.0 ounces, and a package quantity of 4 with Weight: 4.0 ounces.
The product bullets list an Industry/Government Certification of "UL Listed."
The review summary notes an annual replacement cycle, indicating reviewers replace these filters about once per year.
