Aprilaire 813 Replacement Filter for 2025FG (20x25x4) – MERV 13, Healthy Air

Upgrade your home's air with the Aprilaire 813 Healthy Air 13 Filter

A small change can transform indoor air quality. The Aprilaire 813 replacement filter is designed to work with your whole home air purifier, delivering powerful MERV 13 filtration in a 20x25x4 package. When air circulates through the filter, a broad range of particulates can be captured, helping rooms feel fresher and more comfortable over time.

What this filter tackles

As air moves through the filter, it helps reduce common allergens and irritants. This includes pollen, mold spores, bacteria, pet dander, dust particles, and dust mites. The result can be a noticeable improvement in everyday comfort and air freshness as family activities continue throughout the day.

• Pollen and mold spores are captured before they drift through living spaces
• Bacteria and dust mites are filtered from circulating air
• Dust particles and pet dander are efficiently removed from the airflow

Performance you can count on

With four inches of filtering media, the filter offers a larger surface area to hold dust and particulates compared with standard 1 inch filters. Self-Seal Technology minimizes air bypass, helping the system maintain steady airflow and peak performance.

• Low initial resistance supports consistent airflow and potential energy efficiency
• High dust holding capacity reduces frequent filter changes
• Pure Fit Promise ensures the filter fits your Aprilaire air cleaner exactly

Ease of installation and reliability

Designed for straightforward replacement using the Interlock Rail System. Unpack, slide the filter in, close the door, and you are done. The nominal size is 20 x 25 x 4 inches, matching the model 2025FG and many compatible units with the 4897 Upgrade Kit.

• Three-step installation in minutes
• Made in the USA with a focus on dependable indoor air quality
• Backed by Aprilaire support and the Clean Coil Commitment

Note about filtration: MERV values indicate filtration effectiveness; higher numbers mean stronger filtration. This filter is performance tested to ASHRAE 52.2 standards for MERV 13 filtration.