Filter King 31.5x9.5x1 Air Filter 4-Pack - MERV 8 Pleated

In this review the Filter King 31.5x9.5x1 4-pack of pleated air filters is evaluated for homeowners and renters who need a reliable, easy-to-change 1 in replacement for furnaces and A/C units. The bottom line: this pack is best for people who want consistent particle capture without reducing airflow, and who prefer products fully manufactured in the United States. The most compelling reason to buy is the filter's MERV 8 rating combined with a pleated design that captures more airborne particles while staying thin enough for common 1 in slots.

Key Features

• MERV 8 rating: Provides a balance of particle capture and preserved airflow suitable for most homes and standard HVAC systems.
• Pleated construction: The pleats increase surface area so each filter traps more dust and extends usable life between changes.
• Actual size accuracy: Labeled 31.5 in x 9.5 in x 1 in with an actual thickness of 0.75 in, so it fits typical 1 in filter slots that accept slightly under full thickness.
• Made in USA: Fully manufactured in the United States with an EPA establishment number giving traceability to production.
• 4-pack convenience: Four filters at once reduces shopping frequency and supports scheduled changes every 30 to 90 days.
• Fast installation: Simple open, slide and close replacement that most homeowners can do in a minute or two.

Who It's For

This filter set is aimed at homeowners, renters, and small households using standard 1 in furnace and A/C filter slots who want improved indoor air quality without compromising system airflow. The pleated MERV 8 media is appropriate for households concerned with dust, pollen and common airborne particles but not necessarily for specialized clinical or allergy-level filtration.

Those who should look elsewhere include anyone requiring higher-efficiency filtration than MERV 8, such as very sensitive allergy sufferers who need MERV 11 or higher, or systems that require a true full 1 in thickness rather than 0.75 in actual depth. Also verify dimensions before buying for nonstandard filter compartments.

Pros & Cons

Pros

• Good balance of filtration and airflow from the MERV 8 media.
• Pleated design captures more particles and extends service life between changes.
• Pack of four simplifies maintenance for up to several months of coverage.
• Manufactured in the USA with clear production identification.

Cons

• Actual thickness is 0.75 in, which may be slightly under full 1 in thickness for some tight-fit slots.
• Not intended for users who need high-efficiency medical or allergy-grade filtration.

Specifications

Brand	Filter King
Pack	4-pack
Rated MERV	MERV 8
Labeled Size	31.5 in x 9.5 in x 1 in
Actual Size	31.5 in x 9.5 in x 0.75 in
Made	Made in USA (EPA Establishment Number 103501-FL-1)
Recommended Change Interval	30 to 90 days

Our Verdict

The Filter King 31.5x9.5x1 4-pack is a practical choice for most homes that need reliable particle capture without sacrificing airflow; its MERV 8 pleated media, made-in-USA construction and four-pack format deliver good value for routine HVAC maintenance. Buy this set if you want dependable, easy-to-install replacements and change filters seasonally or quarterly.

Frequently Asked Questions

How long will each filter last?
Each filter can last up to 90 days depending on household conditions, with a recommended change interval of 30 to 90 days for typical use.

Will these fit my unit?
They are labeled 31.5 in x 9.5 in x 1 in with an actual thickness of 0.75 in, so they fit standard 1 in slots that accept slightly under full thickness; measure your filter slot to confirm.

Are these high-efficiency filters?
The filters are MERV 8, which offers solid particle capture for dust and pollen but is not the same as higher-efficiency MERV 11+ allergy or medical-grade filters.