We sell two Aprilaire filter upgrade kits. The Aprilaire 1213 and 1413 upgrade kits. These filter upgrade kits allow you to upgrade your Aprilaire 2200, 2120, 2400 and 2140 Merv 10 filter to a Merv 13 filter! No more fooling around with filter comb spacers! Once the kit is installed you can quickly and easily slide in the Aprilaire 213 or 413 replacement filter! Both kits come with installation instructions, all needed hardware and one replacement filter. We have YouTube videos showing how to install the kits. Please email us anytime if you have questions. Our email address is: firstname.lastname@example.orgWe would love to help you out and earn your business!