Nordic Pure 20x25x5 Lennox X6673 X6675 Replacement MERV 14

In this review of the Nordic Pure 20x25x5 Lennox X6673_X6675 replacement filter, the bottom line is practical: it is for homeowners and HVAC techs who need a high-efficiency, odor-reducing media filter that fits the common 20 x 25 x 5 nominal slot but whose actual dimensions matter. The single biggest reason to buy is its combination of MERV 14 level particle capture and an activated charcoal panel for odor control, giving cleaner indoor air without noticeably choking the system when installed in compatible furnaces and returns.

Key Features

• Nominal and actual sizing: The filter is marketed as 20 x 25 x 5 but lists an actual size of 19 3/4 x 24 3/4 x 4 3/8 so users can confirm fit before installing.
• High filtration efficiency: The MERV 14 rating captures fine particulates and is equivalent to MPR 2800 for improved indoor air quality.
• Carbon odor control: A flat panel infused with activated charcoal helps reduce common household odors and volatile vapors.
• Media construction: Electrostatically charged synthetic pleats increase dust capture while maintaining acceptable airflow in compatible systems.
• Compatibility: Designed as a replacement for Lennox X6673 and X6675 media filters, making it straightforward to swap into systems that accept those reference models.
• Made in the USA: Manufactured domestically, which may matter to buyers prioritizing domestic production.

Who It's For

This filter is best for homeowners, renters with 20 x 25 x 5 nominal filter slots, and HVAC professionals who need a high-performance replacement compatible with Lennox X6673 and X6675 media filters and who want both particle capture and odor reduction. It suits spaces where allergy reduction, dust control, and odor mitigation are priorities and where the heating or cooling system can accept a media filter of roughly 4 3/8 in actual depth.

Customers who should look elsewhere include systems that require an exact 5 in thick filter or have tight clearances; because the product lists a different actual depth, measure the return or filter slot first. Also, those needing only basic dust control might prefer a lower-MERV, lower-cost thin panel filter if system airflow constraints are a concern.

Pros & Cons

Pros

• High particle capture with MERV 14 efficiency for improved indoor air quality.
• Activated charcoal panel provides tangible odor control in homes with cooking or pet smells.
• Good value and fit for customers replacing Lennox X6673_X6675 filters, with multiple customers noting improved dust capture and airflow behavior.

Cons

• Actual dimensions differ from the nominal size, so measuring the filter slot is required before purchase and some buyers report mixed opinions on build size and fit.

Specifications

Brand	Nordic Pure
Nominal Size	20 x 25 x 5 in
Actual Size	19 3/4 x 24 3/4 x 4 3/8 in
Filter Rating	MERV 14 (equivalent to MPR 2800)
Replacement For	Lennox X6673 and X6675
Media Features	Pleated electrostatically charged synthetic with activated charcoal panel
Quantity	4 pack

Our Verdict

The Nordic Pure 20x25x5 replacement is a sensible choice for those who need strong particulate filtration plus odor reduction in systems that accept a roughly 4 3/8 in deep media filter. It delivers MERV 14 performance, a charcoal panel, and reliable dust capture at a reasonable value, but buyers must measure their filter slot to ensure the slightly smaller actual dimensions provide a proper fit.

Frequently Asked Questions

Will this filter fit my 20 x 25 x 5 slot?
Measure your filter slot and compare to the listed actual size of 19 3/4 x 24 3/4 x 4 3/8 in to confirm fit before purchasing.

Does the charcoal panel affect airflow?
The activated charcoal is a flat panel for odor control and the pleated electrostatic media is designed to maintain acceptable airflow for compatible systems, though measuring and system compatibility should be considered.

Is this equivalent to MPR 2800?
Yes, the MERV 14 rating is stated to be equivalent to MPR 2800.