Replacement Filter, 25" x 20", for Aprilaire

Replacement Filter Media, 25" x 20", Fits Aprilaire or Spaceguard 2200, 2120, 2250; Lennox Pmac20; Generalaire Ac-1. Minimum Efficiency Reporting Value Merv- 11. Ships Collapsed and Pops Up When Opened, Which Saves On Shipping and Storage. For The Spaceguard or Aprilaire Units, No Longer Necessary To Use Pleat Spacers or White Plastic Box That Holds Existing Filter.