Nordic Pure 20x25x4 Pleated Air Filter MERV 12 - With Carbon

In this review the Nordic Pure 20x25x4 pleated air filter is evaluated for homeowners and renters who need a higher-efficiency replacement that also reduces odors. The bottom line: this pack of two filters delivers solid particle filtration with an added carbon layer for improved smell control, but buyers must measure their existing filter first since the listed nominal size differs from the actual dimensions. For anyone who wants MERV 12 protection and odor reduction in a commonly used size, these filters are a practical, value-oriented choice.

Key Features

• Actual vs nominal size: The filter lists a nominal 20 x 25 x 4 size while the actual dimensions are 19 1/2 x 24 1/2 x 3 5/8 in, so measuring your filter before ordering prevents fit issues.
• MERV 12 performance: The MERV 12 rating is equivalent to MPR 1500-1900 and gives reliable capture of dust and airborne particles for improved indoor air quality.
• Carbon layer: A fused carbon layer is bonded to the MERV media to reduce odors and provide more surface area without adding excessive airflow restriction.
• Dual-material construction: The pleated MERV media fused to carbon creates 33% more surface area for filtration and odor control compared with some single-layer designs.
• Made in the USA: Manufactured domestically, which is useful for buyers who prefer US-made HVAC parts and consistent production standards.

Who It's For

This filter is best for homeowners, apartment dwellers, and small-business maintenance staff looking for a replacement that balances particle capture and odor reduction. It suits furnaces and HVAC systems that accept a 20 x 25 x 4 nominal filter but require the specific actual depth listed here.

It is not the right choice for systems that need the deeper 4 3/8 in actual depth used by some Honeywell or Lennox 20x25x4-plus-carbon styles; in that case a 20x25x5 replacement that measures 19 7/8 x 24 7/8 x 4 3/8 in should be chosen instead. Also, anyone needing a thinner 3 in or a specialty HEPA replacement should look elsewhere.

Pros & Cons

Pros

• Good balance of filtration and odor control thanks to the fused carbon plus pleated media.
• Manufactured in the USA, offering consistent build quality.
• Provides MERV 12 level filtration comparable to MPR 1500-1900 for better dust capture.

Cons

• Actual size is smaller than the nominal size printed on the package, so some users reported fit and thickness confusion.

Specifications

Our Verdict

The Nordic Pure 20x25x4 MERV 12 pleated filter with carbon is a sensible pick for most homes that need improved particle capture plus odor control at a reasonable cost. Measure the existing filter carefully before ordering to avoid fit issues, and choose the deeper replacement if your system requires a 4 3/8 in actual depth. Overall it represents good value for users who want MERV 12 performance and carbon odor reduction without specialty pricing.

Frequently Asked Questions

Are these filters truly MERV 12?
Yes, the filters are rated MERV 12, which the manufacturer notes is equivalent to MPR 1500-1900 for particle capture.

Will the carbon layer reduce odors?
The fused carbon layer is intended to reduce smells and increases surface area for filtration, so it can help with common household odors.

What if my existing filter seems thicker?
Measure your current filter and compare to the actual size 19 1/2 x 24 1/2 x 3 5/8 in; if your unit requires a 4 3/8 in actual depth, choose the alternate 20x25x5 Honeywell replacement specified by the maker.