Nordic Pure 20x25x5 Lennox Replacement MERV 15 Air Filters 2 Pack

In this review the Nordic Pure 20x25x5 Lennox replacement MERV 15 air filters are assessed for homeowners and light commercial users who need a high-efficiency pleated filter that fits common Lennox media housings. The bottom line: these two-pack filters deliver strong dust capture and steady airflow while emphasizing the importance of measuring because the actual size differs from the nominal size. For anyone replacing Lennox X6673 or X6675 media filters and wanting MERV 15 performance built in the USA, this set is worth considering.

Key Features

• Exact fit guidance: The listing gives both nominal and actual sizes so buyers can measure their filter or housing to ensure the filter will seat properly.
• MERV 15 filtration: High-efficiency media captures fine particles for improved indoor air quality suitable for sensitive households and light commercial use.
• Lennox replacement compatibility: Made to replace Lennox X6673 and X6675, which simplifies finding a compatible aftermarket option for those specific housings.
• Two pack value: Sold as a 2 pack, providing straightforward immediate replacement and a spare filter at a reasonable cost compared with single-unit purchases.
• American manufacture: Filters are made in the USA, which can matter to buyers who prioritize domestic production and consistent construction.
• Depth variance noted: The review highlights that this traditional 5 in nominal filter measures an actual 4 3/8 in, helping avoid fit problems with varied manufacturers.

Who It's For

This filter is best for homeowners, small commercial operators, or building maintenance staff who use Lennox media housings listed as X6673 or X6675 and want high particle capture without severely restricting airflow. It is particularly suited to households concerned about dust, pollen and fine particulates where MERV 15 level filtration is desired.

Those who should look elsewhere include buyers who cannot confirm the actual depth or face dimensions of their current filter or housing, and installers who need an exact 5 in depth from a specific manufacturer rather than the actual 4 3/8 in construction. Also consider different MERV levels if very low resistance or specific HVAC manufacturer recommendations are required.

Pros & Cons

Pros

• High-efficiency MERV 15 media that customers report captures dust and improves air quality.
• Made to replace Lennox X6673 and X6675, offering a compatible aftermarket option for those housings.
• Clear actual dimensions listed so buyers can measure and avoid fit issues.
• Manufactured in the USA, which supports consistent build quality for many buyers.

Cons

• Actual size differs from nominal size (actual 19 3/4 x 24 3/4 x 4 3/8), so measurement is required to ensure proper fit.
• Some customers note mixed opinions on build quality, so expectations should be tempered for heavy commercial use.

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
Replacement For	Lennox X6673 and X6675
Filtration Rating	MERV 15 (equivalent to MPR 2800)
Pack Quantity	2 pack
Country of Manufacture	Made in the USA

Our Verdict

The Nordic Pure 20x25x5 Lennox replacement MERV 15 filters are a sensible choice for those who need strong particulate capture and a clear replacement for Lennox X6673/X6675 housings. They offer good value in a two-pack and are made in the USA, but buyers must measure the actual dimensions to avoid fit issues; when the size matches, they provide noticeable dust control and steady airflow.

Frequently Asked Questions

What size should I measure before ordering?
Measure the actual filter or the housing opening and compare to the listed actual size 19 3/4 x 24 3/4 x 4 3/8 in to ensure a proper fit.

Will this work in Lennox furnaces?
These are made to replace Lennox X6673 and X6675 media filters, so they will work when the actual dimensions match the housing.

How effective is the filter?
With a MERV 15 rating (equivalent to MPR 2800) it captures fine particles and customers report improved air quality and reduced dust.