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Why Walmart Pre-Owned?

for additional details & specific condition qualifications.

Walmart Pre-Owned allows you to find previously owned, well-cared-for items from Walmart’s trusted & performance-managed sellers. Shopping Pre-Owned allows you to bring home the best-quality picks at even lower prices, in addition to extending the life of an item & reducing waste. Find your favorites & shop a range of conditions in every category.

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Save even more on top brands & your most-loved items.

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Save up to 35% on additional pairs

Terms & conditions

Purchase one complete pair of eyeglasses (frame and Rx lenses) and receive 20% off each additional pair. Qualifying purchases include a complete Rx eyeglass pair or insurance order for a complete pair. Insurance benefits maximized on first order, if applicable. Discounts apply to qualifying orders of equal or lesser value. For 35% off on a second pair of glasses, purchase of complete pair of Rx sunglasses. Qualifying purchases include any Rx polarized or non-polarized sun lens and frame. Least expensive pair receives the 35% discount.                                          Exclusions apply, including Ray-Ban Meta, Oakley Meta, and Nuance Audio. Promotions cannot be combined. Discounted pairs must be for same patient, purchased in same transaction. Discounts do not apply to insurance, managed care, third-party payor programs, or state/federal healthcare programs. Valid prescription required. Eye exam not included. Arkansas locations: This firm is not licensed to make eye examinations.

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Filterbuy 20x21x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack

Augmented Reality Experiences

MERV 8 filter captures 90% particles, maintaining airflow.

Clean Air Filtration

20x21x1 (actual 19.50"x20.50"x0.75") fits furnaces, AC, heat pumps, and HVAC systems.

Universal System Fit

Enhances HVAC system efficiency, preserves budget, and supports a healthy lifestyle.

Optimized System Performance

Lasts 3x longer than fiberglass models, recommended replacement every 90 days.

Extended Filter Life

Beverage board frames with wire backing resist moisture and heat.

Durable Frame Build

Easy installation with clear arrows for correct airflow direction.

Effortless Setup

Constructed from recyclable materials, providing an eco-friendly choice.

Eco-Conscious Materials

<ul>  <li>UNIVERSAL COMPATIBILITY: 20x21x1 replacement air filters for your furnace, air conditioner, or heat pump enhance HVAC system efficiency and support a healthy lifestyle (actual size: 19.50" x 20.50" x 0.75")</li>  <li>MERV 8 PERFORMANCE: Protect your home or business from pollen, lint, mold, and more with MERV 8 synthetic media (comparable with MPR 700 &amp; FPR 5) that captures 90% of dust without restricting air flow</li>  <li>LONG-LASTING FILTRATION: Electrostatically charged media with 14 pleats per foot traps more microscopic particles and lasts 3x longer than fiberglass models (replace every 90 days for optimal performance)</li>  <li>SUPERIOR CONSTRUCTION: Easy installation beverage board frames with dual wire backing outperform flimsy cardboard designs by improving durability, preventing warping, and resisting extreme temperatures</li>  <li>MADE IN THE USA: Built with industrial-grade, recyclable materials and proudly manufactured 100% in the United States for dependable indoor air quality that is trusted by millions of homes</li> </ul>

Minimum efficiency reporting values (merv)

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The Filterbuy replacement air filter 20x21x1 (actual size: 19.50" x 20.50" x 0.75") ensures that your furnace, air conditioner, heat pump, or HVAC system is circulating the cleanest air possible to help preserve your budget and healthy lifestyle. MERV 8 synthetic media (comparable with Clean Living Dust Defense MPR 700 &amp; FPR 5) is recommended in most scenarios with its capability to trap 90% of dust particles while protecting your home or business from lint, pollen, mold, dander, and other forms of debris without impacting air flow. High quality construction features an electrostatically charged design with 14 pleats per foot that captures more harmful particles and prolongs the products lifespan by three times that of fiberglass models (replace every 90 days for best results). Plus, our industrial grade beverage board frames are paired with dual wire backings that significantly outperform traditional cardboard compositions by improving structural integrity with their ability to endure temperatures up to 200 degrees Fahrenheit and withstand exposure to moisture. Installation is also made simple with the addition of easy-to-understand arrows that help identify the direction of air flow and subsequently the way the filter needs to be placed. To top it off, all our components are 100% manufactured within the United States and designed with recyclable materials, providing an eco-friendly alternative to enhancing your air quality.

Filterbuy 20x21x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack

Key item features

Specs

Filterbuy 20x23x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack $47.96 $47.96/in

Filterbuy 20x23x1 Air Filter MERV 8 Dust Defense, Pleated HVAC AC Furnace Filter Replacement, 4-Pack