Aprilaire 310 Replacement Filter – MERV 11 for Whole-House Air Purifiers (20x20x4)

Upgrade Your Home Air with the Aprilaire 310 Replacement Filter

The Aprilaire 310 Replacement Filter is a four-inch-deep, 20x20x4 inch filter designed to fit Aprilaire whole-house air purifiers. Rated MERV 11 and tested to ASHRAE 52.2 standards, it balances filtration efficiency with low resistance to support your cooling and heating system. Proudly made in the USA, this filter comes with the Pure Fit Promise, helping ensure a precise, dependable fit for compatible models. While individual results vary, this filter is designed to work with your existing purifier to help maintain cleaner air and a well-running system.

What it Traps and Why it Matters

• Pollen and mold spores
• Bacteria and other micro-particles
• Pet dander and common household dust
• Airborne particulates that would otherwise circulate through living spaces

Key Features at a Glance

• 4-inch depth with 21.3 square feet of filtering media for more surface area
• Self-Seal Technology minimizes air bypass to keep more air passing through filtration media
• Interlock Rail System enables a straightforward 3-step replacement—unpack, slide in, close the door
• Nominal size of 20x20x4 inches; designed to fit Aprilaire models 1310, 2310, 3310, and 4300
• Longer filter life (up to 12 months) compared to typical 1–3 month filters
• Made in the USA with a commitment to quality and compatibility

Compatibility and How to Replace

Designed to work with select Aprilaire air purifiers, the 310 model is intended for models 1310, 2310, 3310, and 4300. With the Interlock Rail System, installation is a quick, three-step process designed to minimize waste and fuss. Each pack includes illustrated replacement instructions to help you get the job done efficiently.

Why Choose Aprilaire 310

• Potential benefits include reduced particle buildup in living spaces and ongoing protection for your purifier’s performance.
• The combination of high media area and a sealed filtration path is designed to support reliable operation over time.
• Quality manufacturing and a domestic production footprint accompany a focus on precise fit and dependable performance.

Note: The performance and benefits described are intended to reflect the filter’s design and testing results. Actual air quality improvements depend on your home environment and usage.