Nordic Pure 20x20x5 MERV 8 Replacement Air Filters - 4 Pack

In this review the Nordic Pure 20x20x5 MERV 8 replacement air filter 4 pack is judged on fit, filtration and value for homeowners who want a simple OEM-style swap for Honeywell or Lennox units. The bottom line: this pack is a practical, well-built option for anyone seeking basic particulate reduction and odor control without moving to high-restriction filters. Measure your current filter carefully and compare to the listed actual size before buying, because the nominal and real dimensions differ on these thicker pleated filters.

Key Features

• Actual dimensions: The filter lists the real measurements as 19 5/8 x 19 7/8 x 4 3/8 in so you can confirm fit rather than rely on nominal sizing.
• MERV 8 filtration: Provides reliable particle capture equivalent to MPR 800, which helps reduce dust and common household allergens while keeping airflow reasonable.
• Honeywell/Lennox replacement: Designed to replace Honeywell 20x20x4 and similar filters with an actual 4 3/8 in depth, simplifying compatibility checks for many furnaces.
• Four pack value: Sold in a set of four, this pack lowers per-filter cost and makes routine seasonal replacement straightforward.
• Made in the USA: Manufacturing in the United States gives clear provenance and consistent build quality for the pleated media and frame.
• Odor reduction: Customers report the filters help reduce common household smells such as burned popcorn and cooking odors, improving perceived air quality.

Who It's For

This product is aimed at homeowners and renters who need an economical, OEM-style replacement for 20 x 20 furnace housings that accept a roughly 4 in thick pleated filter. It suits anyone wanting improved air cleanliness over basic fiberglass pads without the higher airflow resistance of high-MERV filters and who values a four-pack for routine maintenance.

Those who should look elsewhere include owners who cannot accept small dimensional variance - measure first because the actual depth is 4 3/8 in - and households requiring medical-grade filtration for severe allergies or immunocompromised occupants, where higher MERV ratings would be preferable.

Pros & Cons

Pros

• Well-built pleated media that installers describe as sturdy and easy to handle during replacement.
• Effective at reducing dust and common odors, delivering noticeable improvement in household air quality.
• Good value as a four-pack for routine seasonal changes, lowering the frequency of purchases.
• Made in the USA, which some buyers prefer for consistent manufacturing standards.

Cons

• The actual dimensions differ from the nominal size, and several customers noted the measurements are smaller than expected, so precise measuring is required before purchase.
• Not intended for homes needing very high filtration; MERV 8 balances capture and airflow but is not medical-grade.

Specifications

Brand	Nordic Pure
Nominal size	20 x 20 x 5 in H
Actual size	19 5/8 x 19 7/8 x 4 3/8 in (19.63 x 19.88 x 4.38)
MERV rating	MERV 8 (equivalent to MPR 800)
Replaces	Honeywell 20x20x4 and similar 4 3/8 in depth filters
Quantity	4 pack
Origin	Made in the USA

Our Verdict

The Nordic Pure 20x20x5 MERV 8 four pack is a sensible, cost-effective replacement if you need reliable dust and odor reduction with modest impact on airflow. Measure the existing filter or housing to confirm the actual dimensions match before ordering; if they do, this set is a practical value for routine HVAC maintenance and performs well as an OEM-style substitute.

Frequently Asked Questions

Are these filters the same as the nominal 20 x 20 x 5 size?
Answer. No, the filters list an actual size of 19 5/8 x 19 7/8 x 4 3/8 in, so you should measure your existing filter or housing to ensure a proper fit.

What level of filtration do they provide?
Answer. They are rated MERV 8, equivalent to MPR 800, suitable for reducing dust, pet dander and common household odors while maintaining reasonable airflow.

Will these work in Honeywell or Lennox systems?
Answer. Yes, they are intended as replacements for Honeywell 20x20x4 and similar filters with the same actual depth, provided the measured dimensions match your unit.