Ships fast! Reduces more airborne particles than the Aprilaire 410 from bacteria to dust to pollen. Replace yearly. Trade-marked Aprilaire Self-Seal technology reduces performance-hampering air bypass. The Aprilaire 413 is a high performance MERV 13 air purifier replacement filter for Aprilaire model air cleaners 1410 2410 3410 and 4400. The collapsible pleated fabric filter media is easily installed to keep your HVAC equipment running at top efficiency. Trade-marked Aprilaire Self-Seal technology ensures the best performance by reducing air bypass. Ultimately this filter when compared to the 410 helps trap and reduce even contaminants. Order today!