The Replacement Aprilaire Expandable Media Filter 413 is compatible with Aprilaire 2400 (1413 Media Rail Kit upgrade is required), 2140 (1413 Media Rail Kit upgrade is required), Aprilaire 4400 with air cleaner control, Aprilaire 1410, 1620, 2410, 3410 without air cleaner control. This Magnet Filter includes 4 wire braces and instructions for assembly. Note: This filter is not manufactured by Research Products Corporation. This is made with MERV 13 Media by Magnet by FiltersUSA (1 Pack)Magnet by FiltersUSA