Filter King 22x37x1 Air Filter 4-Pack - MERV 8 Home HVAC Filters

In this review the Filter King 22x37x1 Air Filter 4-pack is evaluated for homeowners and renters who want a straightforward, cost-effective way to improve indoor air quality. The biggest reason to buy is simple: these are MERV 8 pleated filters that balance particle capture with minimal airflow restriction, and they are fully manufactured in the USA, which matters to buyers who prefer domestic production and consistent construction. The pack offers a practical replacement cycle and easy installation for standard 1 in filter slots.

Key Features

• MERV 8 rating: Captures a wide range of common airborne particles while maintaining adequate airflow for most residential A/C and furnace systems.
• Pleated design: The pleats increase surface area so the filter traps more dust and extends time between changes compared with flat filters.
• Made in USA: Fully manufactured in the United States under EPA establishment 103501-FL-1 for consistent materials and construction.
• 4-pack convenience: Four filters provided per purchase for scheduled replacement over several months without repeated ordering.
• Up to 90 days life: Rated to last as long as 90 days depending on home conditions, with a typical recommended change window of 30 to 90 days to protect HVAC longevity.
• Easy installation: Open, slide and close installation makes replacements quick and tool-free for most household systems.

Who It's For

This product suits homeowners and renters with standard 1 in filter slots who want a balance of filtration and airflow without moving to higher-resistance, higher-cost media. It is useful for those managing dust, pet dander and average indoor pollutants and who prefer filters made in the United States.

It is not aimed at households needing HEPA-level filtration for severe allergy or immunocompromised situations, and buyers requiring nonstandard sizes or thicker filters should look for alternatives designed for those specific needs.

Pros & Cons

Pros

• Good balance of particle capture and airflow thanks to the MERV 8 pleated media.
• Made in the USA, which supports consistent build quality and manufacturing traceability.
• Convenient 4-pack and simple installation reduce the hassle of regular replacement.
• Can last up to 90 days depending on conditions, offering value for money when rotated as recommended.

Cons

• Size tolerance has mixed feedback, so buyers should confirm actual dimensions (21.5 in x 36.5 in x 0.75 in) before purchasing to ensure a proper fit.
• Not suitable for users who require HEPA-level filtration or thicker filters for heavy particulate environments.

Specifications

Product Type	Pleated 1 in HVAC filter
Rated MERV	8
Pack Quantity	4
Nominal Size	22 in x 37 in x 1 in
Actual Size	21.5 in x 36.5 in x 0.75 in
Country of Manufacture	United States (EPA 103501-FL-1)
Recommended Replacement	Every 30 to 90 days depending on use

Our Verdict

The Filter King 22x37x1 4-pack is a sensible choice for most households seeking reliable MERV 8 filtration with simple installation and domestic manufacture. It provides good value through a 4-pack and up to 90 days of life in normal conditions, making it a practical option for routine HVAC maintenance when HEPA-level filtration is not required.

Frequently Asked Questions

What are the actual dimensions?
The listed actual dimensions are 21.5 in x 36.5 in x 0.75 in, which should be checked against the unit slot before purchase.

How often should these filters be replaced?
Replace every 30 to 90 days depending on dust load, pet presence and HVAC usage; the manufacturer rates them up to 90 days under lighter conditions.

Will these restrict airflow?
With a MERV 8 rating the pleated media is designed to trap particles without significantly impacting normal residential airflow, but higher MERV levels could increase resistance.