Filter King 35x18.5x1 Air Filter 4-Pack - MERV 8 Performance

Our review of the Filter King 35x18.5x1 Air Filter 4-pack finds it to be a practical choice for homeowners who want steady, reliable filtration without fuss. The biggest reason to buy is simple: these MERV 8 pleated filters capture common airborne particles while maintaining airflow, and they arrive as a convenient set of four with consistent sizing for standard 1 in slots. The pack is fully manufactured in the United States and promises up to 90 days of use per filter under typical conditions, which makes it an easy replacement option for A/C and furnace systems.

Key Features

• MERV 8 rating: Offers balanced particle capture for dust and allergens without restricting normal HVAC airflow.
• Pleated design: Increased surface area captures more particles and helps extend the effective life of each filter.
• Actual size accuracy: Labeled 35 in x 18.5 in x 1 in with an actual thickness of 0.75 in, so it fits most standard 1 in filter slots when installed correctly.
• Made in USA: Fully manufactured in the United States using materials and construction tracked to an EPA establishment number.
• Replacement cycle guidance: Rated to last up to 90 days, with recommended change intervals of 30 to 90 days depending on use and environment.
• Easy installation: Simple open, slide and close design makes swapping filters quick and tool-free.

Who It's For

This 4-pack is best for homeowners with central A/C or furnace systems who need dependable, low-maintenance filtration that balances dust and allergen capture with airflow. It is also a good match for those who prefer products made domestically and want consistent size and construction across multiple replacements.

Those who need hospital-grade filtration, very fine particle capture, or filters thicker than 1 in should look elsewhere, since the MERV 8 rating is aimed at general residential use rather than specialized filtration needs.

Pros & Cons

Pros

• Consistent fit and build quality that customers describe as a perfect fit for 35 in x 18.5 in slots.
• Pleated construction captures more particles and extends filter life compared with flat filters.
• Made in the USA with traceable manufacturing information for buyers who value domestic production.

Cons

• Actual thickness is 0.75 in, which may be slightly thinner than some 1 in slots expect; proper installation is important to avoid gaps.
• Not intended for environments that require higher than MERV 8 protection, such as medical or industrial settings.

Specifications

Brand	Filter King
Pack size	4-pack
Rated size	35 in x 18.5 in x 1 in
Actual size	35 in x 18.5 in x 0.75 in
MERV rating	MERV 8
Made in	United States (EPA Establishment 103501-FL-1)
Recommended change interval	30 to 90 days

Our Verdict

The Filter King 35x18.5x1 4-pack is a sensible, good-value choice for most residential HVAC systems that need reliable particle capture and easy maintenance. It delivers consistent fit and construction, pleated filtration that improves lifespan, and the convenience of four replacements; buyers who need higher efficiency should consider a higher MERV option, but for everyday home use this is a practical pick.

Frequently Asked Questions

How often should these filters be replaced?
Change every 30 to 90 days depending on household conditions; the filters can last up to 90 days in lower-dust environments.

Will these fit a standard 1 in filter slot?
Yes, they are labeled as 35 in x 18.5 in x 1 in with an actual thickness of 0.75 in, so they fit most standard 1 in slots when installed correctly.

Do these filters reduce airflow?
The pleated MERV 8 design is intended to trap particles without significantly impacting normal HVAC airflow.