Nordic Pure 20x20x4 Pleated MERV 8 Air Filters 6 Pack - Reliable HVAC

Our review of the Nordic Pure 20x20x4 pleated air filters tests their fit and filtration for common residential HVAC systems. These six-pack filters are aimed at homeowners and renters who want a straightforward replacement that balances dust control with airflow. The single biggest reason to buy is the combination of a true MERV 8 rating with clear actual dimensions, which helps avoid the common mismatch between nominal and real filter sizes when swapping into furnaces and air handlers.

Key Features

• Nominal and actual sizing: The filters list a nominal size of 20 x 20 x 4 and an actual size of 19 1/2 x 19 1/2 x 3 5/8 so buyers can measure their slot and confirm fit before purchasing.
• MERV 8 performance: The pleated electrostatically charged media captures common airborne particulates while maintaining good airflow for typical residential systems.
• Compatibility note: Nordic Pure calls out units that use a 4 3/8 depth and directs customers to a different model when a deeper actual depth is required, reducing the risk of ordering the wrong thickness.
• Made in the USA: Manufactured domestically, which may matter to buyers prioritizing local production and consistent quality.
• Value pack: The six-pack format offers a straightforward, economical supply for routine maintenance and seasonal filter changes.

Who It's For

This filter set is best for homeowners and renters with furnaces, air handlers, or filter slots that accept a 20 x 20 x 4 nominal filter but require verification of actual dimensions. It suits those who want MERV 8 level filtration to reduce dust and improve indoor air without imposing heavy strain on the system.

These are not the right choice for systems that require a 4 3/8 actual depth filter or a higher MERV rating; customers with Honeywell or Lennox units that use a deeper actual filter should choose the alternative Nordic Pure 20x20x5 replacement specified for those depths.

Pros & Cons

Pros

• Good balance of filtration and airflow thanks to the pleated, electrostatic media.
• Clear actual dimensions listed so shoppers can measure and confirm fit before purchase.
• Six-pack provides value and reduces the frequency of reordering.
• Made in the USA, which supports consistent manufacturing standards.

Cons

• Some customers report the thickness and fit vary compared with expectations, so measuring is essential.
• Not suitable if your unit needs a 4 3/8 actual depth filter; you must select the alternate product.

Specifications

Brand	Nordic Pure
Nominal Size	20 x 20 x 4 in
Actual Size	19 1/2 x 19 1/2 x 3 5/8 in
MERV Rating	MERV 8 (equivalent to MPR 800)
Pack Quantity	6 filters
Manufactured	Made in the USA

Our Verdict

The Nordic Pure 20x20x4 MERV 8 six-pack is a practical choice for most homes that need reliable dust control without restricting airflow. It represents good value and clear sizing information, but buyers must measure their filter slot to avoid the occasional thickness mismatch or the need for a deeper replacement in some Honeywell or Lennox units.

Frequently Asked Questions

Are these filters true to size?
They list an actual size of 19 1/2 x 19 1/2 x 3 5/8 in, so customers should measure their existing filter to confirm a match.

What is the MERV rating and what does it filter?
These are MERV 8 pleated filters, effective at capturing common household dust and particulates while preserving typical residential airflow.

What if my furnace uses a deeper filter?
If your unit requires a 4 3/8 in actual depth, Nordic Pure recommends the 20x20x5 replacement that measures 19.63 x 19.88 x 4.38 in.