Nordic Pure 20x25x5 Lennox X6673 X6675 Replacement MERV 15

In this review of the Nordic Pure 20x25x5 Lennox X6673_X6675 replacement filter, the bottom line is simple: it is for homeowners and light-commercial operators who need high-efficiency particulate removal plus odor control in a 4 to 5 in filter frame. The reviewer found the single biggest reason to buy is the combination of a true MERV 15 capture rating and an activated carbon layer that tackles odors while still fitting common Lennox X6673 and X6675 replacement slots. Measure your existing filter and compare to the actual size before buying, since nominal and actual dimensions differ on these thicker media filters.

Key Features

• Actual size clarity: The filter lists an actual size of 19.75 x 24.75 x 4.38 in to ensure customers can confirm fit before installation.
• High filtration efficiency: MERV 15 performance (equivalent to MPR 2800) captures fine particles and improves indoor air quality in homes and commercial units.
• Carbon odor control: A flat panel infused with activated charcoal reduces common household odors and VOCs alongside particulate capture.
• Replacement compatibility: Made specifically to replace Lennox X6673 and X6675 media air filters, so it slides into compatible housings without modification.
• Construction and materials: Electrostatic synthetic media provides consistent pleated performance without relying on fiberglass or loose fibers.
• Made in the USA: Domestic manufacture may appeal to buyers prioritizing local production and supply chain clarity.

Who It's For

This filter suits homeowners with bottom-return style boxes and HVAC technicians replacing Lennox X6673 or X6675 media filters who want better dust capture and odor reduction. It is also a solid choice for light-commercial settings where higher particle removal and some VOC/odor adsorption are desired.

Those who should look elsewhere include people who cannot accommodate a 4.38 in actual depth in their filter slot, or buyers who need the absolute lowest airflow restriction for sensitive equipment - a true disposable low-MERV panel may be better for minimal resistance situations.

Pros & Cons

Pros

• High particle capture with MERV 15 performance improves overall indoor air quality and reduces visible dust.
• Activated charcoal layer helps control odors and common household vapors.
• Actual size is specified clearly so fit verification is straightforward.
• Quality construction noted by customers and made in the USA.

Cons

• Actual depth differs from the nominal 5 in size, so buyers must measure their slot carefully before ordering.
• Heavier filtration can slightly reduce airflow compared with lower-MERV disposable panels in some systems.

Specifications

Our Verdict

The Nordic Pure 20x25x5 replacement filter is a practical choice for anyone needing high-efficiency filtration and modest odor control in systems that accept a 4+ in media filter. It offers clear sizing, strong dust capture and a carbon layer at a reasonable value, making it a sensible buy for homeowners and maintenance pros who prioritize cleaner air rather than the absolute lowest airflow restriction.

Frequently Asked Questions

Will this filter fit my system?
Check the actual size of your existing filter slot and compare it to 19.75 x 24.75 x 4.38 in; the nominal 20 x 25 x 5 in label is not the true fitted dimension.

Does it reduce odors?
Yes, the flat panel infused with activated charcoal is designed to attract and reduce common odors and some vapors while the pleated media captures particles.

Is this equivalent to MPR 2800?
Nordic Pure lists this MERV 15 offering as equivalent to MPR 2800 for particle removal performance.