AprilAire 20 in. W X 25 in. H X 4 in. Synthetic Fiber 11 MERV Pleated Air Filter

Breathe easier with the AprilAire 20 in. W x 25 in. H x 4 in. Synthetic Fiber 11 MERV Pleated Air Filter—the high-efficiency solution built for homes that care about clean air. This 4-inch-thick filter uses a pleated synthetic fiber media to deliver a robust barrier against airborne particles, helping improve indoor air quality where you live, work, and relax.

What makes it stand out

• 11 MERV rating balances strong particle capture with good airflow, targeting common indoor irritants without overburdening your HVAC system.
• Pleated synthetic fiber media provides increased surface area for filtration, meaning fewer filter changes and more consistent performance between replacements.
• Captures bacteria, pollen, dust, and mold spores—ideal for allergy sufferers and households with pets or seasonal allergies.
• Pet dander reduction helps lessen persistent pet-related indoor pollution and helps keep living spaces more comfortable.
• Single filter per package with a durable build designed to fit standard frames and support ongoing indoor air quality improvements.

How it fits your system

Nominal size: 20 x 25 x 4. Actual size: 20.6 x 26.63 x 4. This filter is designed for 20x25x4 HVAC slots, but because its precise dimensions can vary by model, you may need to trim to achieve a perfect, snug fit in your furnace or air handler. Its 4-inch depth ensures a sturdy seal and less bypass around the edges during operation.

Ideal use cases

• Homes with pets or multiple occupants seeking relief from allergy symptoms
• Residents in pollen-heavy climates looking to reduce outdoor allergen intrusion
• Air-handling systems where a balance of filtration efficiency and airflow is important
• Anyone replacing an existing 20x25x4 pleated filter and wanting a reliable, brand-name option

Why choose AprilAire

AprilAire blends trusted filtration technology with practical design to deliver a filter that supports healthier indoor air without complicating maintenance. The 11 MERV rating and pleated synthetic media work together to capture a broad range of particulates, helping your HVAC system run efficiently while reducing the buildup of dust and other irritants in living spaces.

Smart replacement and care

• Replace based on your household’s needs—more often in homes with pets, high traffic, or during peak allergy seasons
• Inspect the fit during installation to ensure a tight seal; improper sealing can reduce filtration performance
• Store replacement filters in a clean, dry area to preserve media integrity until you’re ready to install

Technical snapshot

• Brand: AprilAire
• Product Type: Pleated air filter
• Material: Synthetic fiber
• Filters Bacteria: Yes
• Filters Pollen: Yes
• Filters Dust/Lint: Yes
• Filters Mold Spores: Yes
• Filters Pet Dander: Yes
• Filters Smoke: No
• Filters Viruses: No
• Filter Class / MERV Rating: 11
• Actual Size: 20.6 x 26.63 x 4
• Air Filter Size: 20x25x4
• Number in Package: 1