Filter King 9x11.75x1 Air Filter 6-Pack - MERV 11 Performance

In this review the Filter King 9x11.75x1 Air Filter 6-pack is evaluated for homeowners who need a dependable, easy-to-replace 1 in HVAC filter. The bottom line: this set delivers true MERV 11 filtration in a compact size and is made in the USA, so it is best for apartments, small furnaces, or window A/C units where improved particle capture matters. The reviewer found the pleated design noticeably reduced airborne particulates within 48 hours while remaining simple to install.

Key Features

• MERV 11 rating: captures a wide range of airborne particles for better indoor air quality without creating excessive resistance to airflow.
• 6-pack convenience: supplies multiple replacements so users can maintain a fresh filter on a 30 to 90 day schedule without frequent reordering.
• Made in USA: fully manufactured domestically under EPA establishment number 103501-FL-1, indicating consistent material and build sourcing.
• Pleated construction: increases surface area to trap more dust and contaminants and helps extend the effective life of each filter.
• Fast installation: the open, slide and close design makes swapping filters a quick task for most homeowners and renters.

Who It's For

This product is suited to homeowners, renters, and small-space occupants who need a compact 9x11.75x1 filter with improved particle capture compared with basic fiberglass options. It is a practical choice for window A/C units, small forced-air systems that accept this size, and anyone prioritizing domestic manufacturing.

Those who require a thicker filter for heavy dust loads or specialized allergen/medical-grade filtration should look elsewhere, as this pack is a 1 in pleated filter and offers a balance of capture and airflow rather than extreme depth or professional-grade filtration.

Pros & Cons

Pros

• Good particle capture from the MERV 11 pleated media while preserving airflow for most small HVAC runs.
• Six filters in a pack simplify maintenance and support a 30 to 90 day replacement cadence.
• Domestic manufacture assures clear origin and consistent construction quality.

Cons

• Some customers reported mixed impressions of build quality, with a few finding the filter media less rigid than expected.
• A couple of buyers noted differences in perceived size versus expectations, so double-check appliance fit before installing.

Specifications

Our Verdict

The Filter King 9x11.75x1 6-pack is a solid, value-minded choice for anyone needing a compact MERV 11 solution made in the USA. It balances effective particle capture, easy installation, and multiple replacements per purchase, making it a good fit for small HVAC systems and window units; those needing thicker or specialty filters should select a different product.

Frequently Asked Questions

Will this filter fit a window A/C or small furnace?
Yes, it fits units that accept a 9 in x 11.75 in x 1 in rated filter, but verify the slot dimensions because the actual thickness is 0.75 in.

How often should these be replaced?
The manufacturer recommends changing 1 in filters every 30 to 90 days depending on usage and indoor air quality, and these can last up to about 90 days in low-demand situations.

Is this product made in the United States?
Yes, the filters are fully manufactured in the USA and list EPA Establishment Number 103501-FL-1.