Filter King 39.5x9.5x1 Air Filter 4-Pack - MERV 8 Pleated Filters

In this review of the Filter King 39.5x9.5x1 Air Filter 4-pack, the bottom line is simple: this set is aimed at homeowners who want a dependable, Made in USA replacement that balances particle capture and airflow without fuss. The reviewer found the MERV 8 rating and pleated design provide a noticeable improvement in home air quality within days, while the four-pack format and recommended 30 to 90 day change interval make it convenient for routine maintenance.

Key Features

• MERV 8 rating: Captures common household airborne particles without significantly restricting airflow, helping HVAC systems run efficiently.
• Pleated construction: The pleated design increases surface area so the filter traps more contaminants and extends usable life between changes.
• Made in USA: Fully manufactured in the United States, giving assurance about materials and consistent construction quality.
• Actual size listing: Labeled 39.5 in x 9.5 in x 1 in with actual dimensions 39.5 in x 9.5 in x.75 in for a reliable fit in compatible housings.
• 4-pack convenience: Four filters per purchase means fewer trips to replace units and predictable scheduling for 30 to 90 day replacements.

Who It's For

This product suits homeowners and renters with standard 1 in filter slots who want a cost-effective mid-level filtration option that balances capture and airflow. It is also a good choice for households without heavy allergy triggers where professional-grade filtration is unnecessary.

Those needing HEPA-level filtration or specific medical-grade air cleaning should look for higher MERV ratings or dedicated air purifiers, since a MERV 8 pleated 1 in filter is intended as general-purpose HVAC protection rather than specialized particulate removal.

Pros & Cons

Pros

• Reliable MERV 8 performance captures dust, pollen and pet dander while maintaining airflow.
• Made in USA construction offers consistent build quality and materials.
• Pleated design and four filters per pack extend service intervals and simplify replacements.

Cons

• Actual thickness is.75 in, which is slightly under the nominal 1 in dimension and should be checked for exact fit in tighter frames.

Specifications

Brand	Filter King
Pack size	4-pack
Nominal size	39.5 in x 9.5 in x 1 in
Actual size	39.5 in x 9.5 in x.75 in
MERV rating	MERV 8
Made in	USA (EPA Est. 103501-FL-1)
Recommended change interval	30 to 90 days

Our Verdict

The Filter King 39.5x9.5x1 4-pack is a practical, value-oriented choice for routine HVAC maintenance, offering dependable MERV 8 filtration and American-made quality. It is a sensible buy for most homes that need better particle capture than basic fiberglass filters without sacrificing airflow or spending on specialty media.

Frequently Asked Questions

How often should these filters be changed?
Filter King recommends changing 1 in filters every 30 to 90 days depending on household conditions and system usage.

Will a MERV 8 filter restrict my airflow?
A MERV 8 pleated filter is designed to trap particles while maintaining airflow suitable for typical residential HVAC systems.

Are these filters manufactured in the United States?
Yes, these filters are fully manufactured in the USA and list EPA Establishment Number 103501-FL-1.