Filterbuy 20x21x1 MERV 8 Pleated HVAC AC Furnace Air Filters (4-Pack)

The Measurement System: Minimum Efficiency Reporting Value (MERV) MERV rates the ability of filters to trap particles on a scale of 1-20, with 20 capturing the smallest microns.

Standard Protection (90%) MERV 8 Air Filters are perfect for almost any home or business that wants great indoor air quality at a reasonable rate.

Superior Protection (95%) MERV 11 Air Filters are ideal for homes or businesses accounting for factors like pets, smokers, and allergy sufferers.

Optimal Protection (98%) MERV 13 Air Filters are perfect for larger homes or businesses, and those who want the best possible filtration experience.

Odor Eliminator (90%) MERV 8 Air Filters with Activated Carbon are perfect for homes or businesses that want to inhibit unpleasant smells with reliable MERV 8 quality.

Product Offerings We offer a variety of MERV 8, 11, and 13 air filters in popular sizes like 20x21x1, 16x20x1, 16x25x1, and 20x20x1. These filters feature pleated, electrostatically charged media that captures more particles than fiberglass models, lasting 3x longer. The industrial-grade beverage board frames with dual wire backings also improve structural integrity.

Choosing the Correct Filter Size The nominal size (e.g., 16x20x1) is a rounded number, while the actual size (e.g., 15.50x19.50x0.75) depicts the filter's precise dimensions. Measure your current filter to find the actual size, then round up to the nearest inch to get the nominal size.

Why Change Your Air Filter? Changing your air filter regularly maintains a healthy lifestyle by reducing the risk of asthma, allergies, and other respiratory issues. Old filters can also cause system defects, leading to energy costs and repairs.

When to Change Your Air Filter? We generally recommend replacing your filter every 90 days, but this may vary based on factors like pet ownership, allergies, and the number of occupants in your home.

Will These Air Filters Fit My System? Our filters are universally compatible with most furnaces, air conditioners, heat pumps, and HVAC systems. Just make sure to choose the proper size that matches your unit.

How Many Air Filters Do I Need? The number of filters needed depends on your specific situation, such as the number of vents in your home. Our selection includes package quantities ranging from 1 to 12 filters.

How to Change Your Air Filter? Turn off the power, remove the old filter, and insert the new one in the direction of airflow. Then replace the cover and turn the power back on.

About Filterbuy Filterbuy is committed to providing everyone with access to clean indoor air. We manufacture high-quality, custom-sized air filters in the USA, offering a variety of filtration levels to meet your needs. Our green frames symbolize the peace of mind that comes with breathing crisp, pure air.

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