Filtrete Furnace & AC Air Filter 20x20x4 MPR 1000 MERV 11 — 2-Pack Electrostatic Allergen Defense

Filtrete 20x20x4 MPR 1000 is a 2-pack of electrostatic HVAC filters rated MERV 11 that captures a wide range of household particles while fitting systems sized for a 4.31-inch depth.

This Filtrete premium furnace and AC filter from 3M is engineered to reduce airborne particles in living spaces using Filtrete 3-in-1 technology. With an MPR 1000 and MERV 11 efficiency, the filter combines electrostatic attraction and layered media to trap both large debris and many fine particles common in homes—pets, pollen, dust and some particulates from smoke. Each pack contains two full-size filters measuring 19.88 x 19.88 x 4.31 inches (actual dimensions) intended for use in furnaces, air conditioners and HVAC units compatible with 4-inch filter depths.

How does this filter improve indoor air quality?

The Filtrete 3-in-1 media uses electrostatic charge plus mechanical filtration to capture particles throughout the airflow, helping reduce the number of airborne irritants circulating in your home. It is certified asthma and allergy-friendly and tested to industry standards for particle capture.

• Rated MERV 11 and MPR 1000 for enhanced particle capture
• Electrostatic fibers attract fine particulates like pet dander and smoke
• Captures larger contaminants: lint, dust, pollen, and mold spores
• Two filters per pack for up to 12 months of combined service when changed yearly

Will this Filtrete filter fit my system that lists Honeywell-sized filters?

The filter’s actual dimensions are 19.88 x 19.88 x 4.31 inches and it is designed to work with systems that accept a 4-inch (or larger) filter depth, including many Honeywell media air cleaners. Confirm your equipment specifies a 20x20x4 nominal or accepts a 4.31-inch thickness to ensure a proper fit and seal.

• Actual size: 19.88 x 19.88 x 4.31 inches
• Fits systems calling for 4-inch nominal depth or larger
• Compatible with many Honeywell media air cleaner setups
• Two-filter pack simplifies replacement scheduling

How often should I replace the Filtrete 20x20x4 MPR 1000 filter?

For optimal performance and airflow, replace each 4-inch filter at least once every 12 months; more frequent changes may be needed in homes with pets, heavy dust, or high pollution. Use the Filtrete Smart App to set reminders at 90-, 180- or 365-day intervals to match your household’s needs.

• Recommended replacement: every 12 months under normal conditions
• Change sooner if there are pets, smokers, or increased particulate load
• Smart App reminders available for regular maintenance
• Regular replacement supports HVAC efficiency and lifespan

What specific particles does this MPR 1000 filter capture?

This filter is designed to trap a spectrum of particles: it collects large contaminants like lint and pollen, and reduces many small airborne particles down to the submicron range as measured by industry tests. While not a medical device, it helps lower common household allergens and airborne debris that affect comfort and cleanliness.

• Large particles: lint, dust, pollen, and visible debris
• Common allergens: pet dander and mold spores
• Smaller particles: smoke and fine particulates as evaluated by ASHRAE-standard testing
• Designed to balance filtration with airflow for HVAC compatibility

Who is this for? Homeowners and renters with a 4-inch HVAC filter slot who want stronger filtration than standard fiberglass filters—especially those with pets, seasonal allergies, or urban pollution concerns. This two-pack is convenient for households that prefer annual filter changes and value a brand recognized across North America for residential HVAC filters. Always check your system’s required dimensions and consult installation guidelines before swapping filters.