Aprilaire 413CBN Odor Reduction Filter Replacement for Whole-Home Air Purifiers, MERV 13 with Activated Carbon Removes Odors From Pets and Cooking, Filters VOCs and Particulates. Aprilaire 413CBN filters are collapsible replacement media filter for the following air cleaner models: • Aprilaire 1410 • Aprilaire 2410 • Aprilaire 3410 • Nominal Size: 16" x 27" x 4" This filter needs to be changed every 6-12 months depending on your home's indoor air quality. If you have an Aprilaire 3410 air purifier, your event-based control will indicate when it is time to change your filter. This new style filter media DOES NOT require the use of pleat spacers. The Aprilaire 413CBN replacement filter provides MERV 13 particulate filtration performance without the need for installing pleat spacers like the old Space-Gard 401 media. The Aprilaire 413CBN filter simply pops up to the proper size and slides directly into several models of the Aprilaire filter cabinets.