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Fast and Easy Upgrade for Improved Filter Performance. This kit includes: one new high-performance 413 filter (genuine Aprilaire filter); and the easy-install system frame: two rails, four uprights, and a door seal. It takes just 30 seconds to snap together. QUICK INSTALL GUIDE: 1)Remove that clunky old filter from your furnace. 2)Slide in the new frame. 3)Slide the new 413 filter onto the rails. (No more pleat spacers!) This upgraded kit is easy to use and provides better filter performance. So ditch the old 401 filter and experience easy maintenance and improved air quality with the genuine Aprilaire 413 filter.