Universal-4-Pack
Protects all against
MERV-13

21.25×21.25×1

21.25×21.25×1
AC Furnace Air Filter
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Product Description

Filter Size: 21.25×21.25x1A

Actual Size: 21.25×21.25×1

Actual Size Fraction : 21-1/4×21-1/4×1

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21.25×21.25×1 Air Filters

Revitalize your indoor environment with our cutting-edge 21.25×21.25×1 Air Filters, available exclusively for online purchase at Custom Filters Direct. These filters stand as a testament to superior air filtration, catering to the needs of both residential and commercial spaces. Ensure a continuous flow of clean and fresh air with this high-performance solution.

Key Features:

  • Versatile Replacement: Tailored to be the perfect replacement for your furnace, air conditioner, heat pump, or HVAC system, the 21.25×21.25×1 air filters offer a seamless upgrade to your filtration system. Experience enhanced performance in various settings, promoting optimal air quality.
  • Precision in Dimensions: With exact dimensions of 21.25×21.25×1 inches, these filters are crafted for a precise fit, minimizing air bypass and maximizing filtration efficiency. Ensure a seamless integration into your existing system, providing enhanced air quality throughout your space.
  • High-Quality Construction: Crafted with meticulous attention to detail, these filters boast high-quality construction. The electrostatically charged pleated filter media ensures effective filtration, while the reinforced wire backing enhances structural integrity. The durable frame is designed to resist heat and humidity, ensuring a long-lasting and reliable filtration solution.
  • Extended Lifespan: Engineered to last for an impressive 3 months, these filters provide a 300% longer lifespan compared to traditional fiberglass models. Say goodbye to the inconvenience of frequent replacements and enjoy sustained protection against airborne contaminants.
  • Made in the USA: Showcasing our commitment to quality and environmental responsibility, these filters are proudly 100% manufactured in the United States. 


Upgrade your air filtration system with confidence using our 21.25×21.25×1 Air Filters. Purchase online from Custom Filters Direct and embark on a journey toward a healthier indoor environment. Breathe easier, live healthier – order your air filters today!