Filter King 20x22.25x1 Air Filter 4-Pack - MERV 13 Performance

In this review the Filter King 20x22.25x1 4-pack is evaluated for homeowners and renters seeking a higher-capture HVAC filter without complicated installation. The bottom line: these are a practical, American-made MERV 13 pleated filter that noticeably improves air clarity within days and fits standard returns when the listed dimensions match the slot. The review focuses on real-world use, longevity expectations, and a few fit and sturdiness caveats to help decide if this 4-pack suits your furnace or A/C routine.

Key Features

• MERV 13 filtration: Captures a wide range of airborne particles, helping reduce allergens and improve indoor air quality within 48 hours of use.
• Pleated design: The pleats increase surface area so the filter can trap more particles and extend time between changes compared with flat filters.
• Made in USA: Fully manufactured domestically with an EPA establishment number, which may matter for buyers who prioritize US production.
• Lasts up to 90 days: Designed for 30-90 day replacement intervals for 1 in filters, giving flexibility based on household conditions.
• Fast installation: Simple open, slide and close installation works with most standard HVAC housings for quick replacement.
• Actual vs labeled size: Labeled as 20 in x 22.25 in x 1 in with an actual thickness of 0.75 in, so checking slot clearance is recommended before purchase.

Who It's For

The Filter King 4-pack is best for homeowners or renters with compatible 1 in filter slots who want a higher-efficiency MERV 13 option to reduce airborne particles, pet dander, and pollen. It suits families concerned about indoor air clarity and anyone who prefers products manufactured in the United States.

Those who need unusually rigid frames, nonstandard custom sizes, or exact full 1 in thickness should look elsewhere, since some customers report mixed sizing impressions and occasional concerns about sturdiness under heavy airflow. If your system requires thicker filters or you want premium rigid frames, consider alternate lines designed for heavy-duty use.

Pros & Cons

Pros

• High MERV 13 rating for improved particle capture and noticeable air clarity.
• Pleated construction extends filter life and offers better capture without compromising airflow.
• Made in USA construction with a clear EPA establishment reference for buyers who value domestic manufacturing.
• Simple open-slide-close installation makes replacement quick and tool-free.

Cons

• Actual thickness is 0.75 in rather than a full 1 in, so fit may vary in some returns and needs checking before purchase.
• Some users report concerns about sturdiness; the media can feel less rigid than higher-end framed filters.

Specifications

Brand	Filter King
Model Pack	4-pack
Rated Size	20 in x 22.25 in x 1 in
Actual Size	20 in x 22.25 in x 0.75 in
MERV Rating	MERV 13
Country of Manufacture	Made in USA (EPA Establishment 103501-FL-1)
Recommended Replacement	Every 30 - 90 days (1 in filters)

Our Verdict

The Filter King 20x22.25x1 4-pack is a solid choice for most households that need higher-efficiency MERV 13 filtration and prefer American-made products; it improves air clarity quickly and is easy to install. Buyers should verify slot dimensions due to the actual 0.75 in thickness and be aware the frame/media feels less rigid than premium options, but as a value-focused MERV 13 4-pack it offers good performance for routine home use.

Frequently Asked Questions

Are these true 1 in filters?
They are labeled 1 in but the actual thickness is 0.75 in, so measure your return slot before installing.

How long will each filter last?
They can last up to 90 days depending on home conditions, with a general recommendation to replace every 30-90 days for 1 in filters.

Do they reduce allergens and dust?
Yes, the MERV 13 pleated media captures a broad range of airborne particles and many users report improved air clarity within 48 hours.