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AC Furnace Air Filter
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Product Description

Filter Size: 20x25x4

Actual Size: 19.5×24.5×4

Actual Size Fraction : 19-1/2×24-1/2×4

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20x25x4 Air Filters

Welcome to Custom Filters Direct, your dedicated partner for advancing air quality solutions. Uncover the extraordinary features of our 20x25x4 Air Filters, meticulously designed to enhance the air quality in both residential and commercial spaces. Simplify the process of elevating your indoor air quality by conveniently purchasing these high-performance filters online from us.

Key Features:

  • Optimal Filter Size: Specifically engineered for 20x25x4 HVAC systems, our filters boast actual dimensions of 19.38×24.38×3.64 inches. This ensures a snug and precise fit, optimizing the overall performance tailored to the unique specifications of your unit.
  • Extended Change-out Interval: Enjoy an extended 3-month filter change-out interval, providing you with peace of mind and reducing the hassle of frequent replacements. This feature ensures consistent filtration efficiency over a more extended period.
  • Advanced Filter Media: Experience superior filtration with our 100% synthetic gradient media, enriched with antimicrobial properties. This innovative media not only efficiently captures but also neutralizes a broad spectrum of airborne particles, contributing significantly to fostering a healthier indoor environment.
  • Robust Filter Support Grid: Our filters incorporate a 30-gauge galvanized expanded metal support grid, ensuring optimal performance and durability. This robust support structure enhances the longevity and effectiveness of the filter, providing you with enduring and reliable air filtration.
  • Durable Box Frame: The double-wall beverage board construction of our box frame is designed to be moisture-resistant, ensuring the integrity of the filter even in challenging conditions. This thoughtful design enhances the overall durability and reliability of our 20x25x4 Air Filters.
  • Temperature and Humidity Resistant: Engineered to withstand varying environmental conditions, our filters boast a maximum temperature tolerance ranging from 180°F to 225°F. Additionally, these filters exhibit resistance to 100% relative humidity, ensuring consistent performance in diverse settings.
  • Available MERV Ratings: Tailor your filtration needs with our 20x25x4 Air Filters, available in multiple MERV ratings. Choose from MERV 8, MERV 8 ODOR, MERV 11, and MERV 13, providing you with the flexibility to customize the level of filtration based on your specific requirements.


Upgrade to the superior filtration capabilities of our 20x25x4 Air Filters today. Order online from Custom Filters Direct and experience the positive impact on your indoor air quality – breathe in cleaner, fresher air with confidence! Elevate your indoor environment with our advanced air filtration technology, ensuring a breath of fresh air every day.