Filterbuy 20x25x4 MERV 11 Allergen Defense Air Filters (4-Pack)

At Filterbuy, we pride ourselves on being a one-stop shop for all your air conditioner, furnace, or HVAC system filter replacements. We offer hundreds of custom sizes in a variety of filtration ratings to ensure that you can find the perfect fit, regardless of your specific needs. This helps us achieve our goal of providing you, your family, and your community access to clean indoor air that enables you to live and breathe freely.

Our products offer premium features that provide an enhanced filtration experience. We feature a pleated, electrostatic design that captures more particles and a reinforced beverage board frame capable of withstanding extreme temperatures. We give customers the ability to simply purchase the exact filter size they need from the comfort of their homes, and our robust supply chain ensures that we can deliver these custom sizes quickly at no extra cost. We love being able to provide a service that helps keep our community healthy.

Our air filters are rated using the Minimum Efficiency Reporting Value (MERV) scale, which ranges from 1 to 20 and measures a filter's ability to trap particles of different sizes. MERV 8 filters are perfect for almost any home or business that wants great indoor air quality at a reasonable rate, capturing 90% of airborne particles. MERV 11 filters are ideal for homes or businesses accounting for factors like pets, smokers, and allergy sufferers, capturing 95% of airborne particles. MERV 13 filters provide optimal protection, capturing 98% of airborne particles, and are perfect for larger homes or businesses, and those who want the best possible filtration experience.

We also offer MERV 8 air filters with activated carbon, which are perfect for homes or businesses that want to inhibit unpleasant smells while still providing reliable MERV 8 quality filtration.

Choosing the correct filter size is important, as the nominal size is a rounded number, while the actual size is the precise measurement of the filter. To find the right size, you can measure your current filter or look for the dimensions listed on the frame. We generally recommend replacing your filter every 90 days to keep your system running efficiently and your air clean, but this can vary based on factors like the number of vents in your home, the presence of pets or smokers, and more.

At Filterbuy, we are committed to championing indoor air quality and providing everyone with access to clean, healthy air. Our green-framed filters are 100% American-made and offer a range of filtration options to meet your specific needs. We also offer a subscription service to make changing your filters a hassle-free process. As our company has grown over the past 70 years, we've remained dedicated to serving our local communities and investing in their well-being.

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