Filter King 9x11x1 Air Filter 4-Pack - MERV 8 Pleated Filters

In this review the Filter King 9x11x1 Air Filter 4-Pack is evaluated for small HVAC returns and compact A/C units; the bottom line is simple: buyers who need an affordable, US-made pleated filter with reliable particle capture will appreciate this set. The single biggest reason to consider these filters is their MERV 8 rating combined with a pleated design that increases surface area and traps more dust and allergens without noticeably restricting airflow. The pack targets routine home maintenance and offers an economical replacement schedule.

Key Features

• MERV 8 rating: Provides mid-level filtration that reduces common airborne particles while maintaining normal system airflow.
• Pleated construction: The pleats increase filter surface area so the filter captures more dust and lasts longer between changes.
• Four-pack convenience: Includes four identical filters so replacements are on hand for routine 30 to 90 day maintenance cycles.
• Made in USA: Fully manufactured in the United States under EPA establishment number 103501-FL-1, indicating domestic production and consistent construction.
• Quick installation: Simple open, slide and close design makes swapping filters fast and easy during seasonal maintenance.

Who It's For

The Filter King 9x11x1 set is best for homeowners or renters with small HVAC return grilles, window A/C units, or compact furnaces that accept a 1 in nominal filter. It suits people who want a balance of air quality improvement and low impact on system performance, and who prefer filters produced domestically.

Those needing hospital-grade filtration, HEPA-level capture, or larger 1.5 in/2 in depth filters for extended life should look elsewhere, as this product is a standard 1 in pleated filter with an actual thickness of 0.75 in and a MERV 8 performance target.

Pros & Cons

Pros

• Effective mid-level particle capture that can noticeably reduce dust and allergens.
• Pack of four provides good value and convenient replacements for routine maintenance.
• Made in the USA with consistent materials and construction under a listed EPA establishment number.

Cons

• Actual thickness is 0.75 in, which may cause a loose fit or fit disagreement in some grilles that expect a full 1 in board.
• Some users report varying impressions of sturdiness, so the frame may feel less rigid compared with heavier-duty filters.

Specifications

Brand	Filter King
Pack Size	4-pack
Nominal Size	9 in x 11 in x 1 in
Actual Size	9 in x 11 in x 0.75 in
Filter Rating	MERV 8
Made	Made in USA (EPA Establishment 103501-FL-1)
Recommended Replacement	30 - 90 days

Our Verdict

The Filter King 9x11x1 4-pack is a sensible choice for routine home HVAC maintenance when a MERV 8 pleated filter is sufficient. It offers good particle capture, easy installation, and the convenience of multiple replacements in one purchase, making it a practical value for households that change filters seasonally or every few months.

Frequently Asked Questions

Are these filters true to size?
They are sold as 9 in x 11 in x 1 in nominal but the actual thickness is 0.75 in, so check your grille fit before purchasing.

How often should I replace them?
Manufacturer guidance recommends changing 1 in filters every 30 to 90 days depending on usage and indoor conditions.

Will these restrict airflow?
With a MERV 8 rating and pleated design they are intended to trap particles without noticeably impacting airflow in residential systems.