Nordic Pure 20x25x5 Replacement MERV 12 Pleated + Carbon Filter - Odor

In this review of the Nordic Pure 20x25x5 replacement filter, the bottom line is simple: it is aimed at homeowners and technicians who need stronger particle capture plus basic odor control in a single, easy-to-fit pack. The reviewer found it particularly useful for systems that call for Lennox X6673 or X6675 replacements and for anyone who wants a higher filtration level without radically restricting airflow. Measure the existing filter first, because the listed nominal size differs from the actual dimensions and that accuracy is the key to a proper fit.

Key Features

• Actual vs nominal size: The filter lists a nominal 20 x 25 x 5 but the actual size is 19 3/4 x 24 3/4 x 4 3/8 so homeowners should measure the filter slot before ordering to ensure a correct fit.
• Lennox compatibility: Made to replace Lennox X6673 and X6675 media filters, it fits systems designed for those part numbers and avoids the trial-and-error of mismatched filters.
• MERV 12 performance: The MERV 12 rating (equivalent to MPR 1500-1900) captures finer particles including dust and improves indoor air quality for allergy-prone households.
• Pleated plus carbon media: The dual-layer construction fuses MERV-rated media with an activated carbon layer to trap odorous gases and VOCs while maintaining filtration performance.
• Made in the USA: Domestic manufacturing may be important to buyers who prefer filters produced locally and with consistent quality standards.

Who It's For

This filter is best for homeowners, renters, or maintenance techs who need a higher-efficiency replacement for furnace and A/C systems that accept 20 x 25 x 5 nominal filters but require checking actual dimensions. It suits households concerned with dust, pollen, and light odors from cooking or pets, and those who appreciate the MERV 12 level without moving to specialty HEPA systems.

It is less suitable for systems with very tight filter housings where even small differences in actual depth matter, or for users who require medical-grade filtration for severe respiratory conditions; those users should consult a professional for higher-grade or custom solutions.

Pros & Cons

Pros

• Good particle capture and perceived improvement in air quality thanks to the MERV 12 media.
• Carbon layer helps reduce household odors and VOCs compared with plain pleated filters.
• Fits as a direct replacement for Lennox X6673 and X6675 when actual size is confirmed.
• Built in the USA, which some customers prefer for quality consistency.

Cons

• Actual size differs from nominal size so measuring is required and some buyers report mixed impressions of build thickness.
• Not a medical-grade HEPA solution for severe allergy or immunocompromised cases.

Specifications

Our Verdict

The Nordic Pure 20x25x5 MERV 12 pleated plus carbon filter is a practical choice for most homeowners who want better dust capture and light odor control without complex installation. It offers good fit and value when the actual dimensions are checked ahead of time, and it replaces common Lennox media filters reliably for standard residential HVAC systems.

Frequently Asked Questions

Will this filter fit my system?
Check the existing filter slot and compare to the actual size 19 3/4 x 24 3/4 x 4 3/8 in; if your slot fits those dimensions it will fit.

Does the carbon layer remove strong odors?
The activated carbon helps reduce common household odors and some VOCs but is not designed for industrial-strength odor removal.

How does MERV 12 compare to other ratings?
MERV 12 captures finer particles than standard fiberglass or lower-MERV pleated filters and is roughly equivalent to MPR 1500-1900 for better indoor air quality.