Aerostar MERV 13 Collapsible Replacement Filter for Aprilaire 213

Aerostar MERV 13 Collapsible Replacement Filter for Aprilaire 213, Aftermarket Replacement Filter for Aprilaire 213 MERV 13 Efficiency Rating, Nominal Size, 20x26x4, Actual Size: 20x26x4 1/8 Fits in Air cleaner models 1210, 2210, 3210 and 4200 Can be used in Air cleaner models 2200 and 2120 if cabinet is upgraded with 1213 Media Upgrade Kit Also replaces Source-1 part S1-FM213, AprilAire is a trademark owned by Research Products Corporation. The seller of this product is not affiliated with or endorsed by Research Products Corporation.