37 x 16.5 x 1 Air Filter 4-Pack - MERV 8 Pleated Filters

In this review the Filter King 37 x 16.5 x 1 Air Filter 4-pack is evaluated for homeowners and renters who need a reliable, easy-to-install replacement for standard HVAC return slots. The bottom line: it is a solid, American-made MERV 8 pleated filter that balances particle capture and airflow for everyday allergy control and system protection. The pack of four and the pleated design make it a practical choice for those who want a low-maintenance option that can last up to 90 days under typical conditions.

Key Features

• MERV 8 rating: Captures a range of airborne particles such as dust and pollen while maintaining steady airflow for most residential systems.
• Pleated construction: The pleated media increases surface area and extends the filter lifetime compared with flat-panel designs.
• Made in USA: Fully manufactured in the United States, which can reassure buyers concerned with domestic quality control.
• Long service interval: The manufacturer states the filters can last up to 90 days, reducing replacement frequency for typical homes.
• Easy installation: The simple open, slide and close fit makes replacements quick for anyone who services their own HVAC filters.
• Actual sizing: Marked actual size of 37 in x 16.5 in x 0.75 in to help ensure a proper fit in 1 in filter slots.

Who It's For

This 4-pack is best for homeowners, renters, and property managers who use standard 1 in filter slots and want an affordable, domestic option that improves indoor air quality without restricting airflow. It suits households with seasonal allergy sufferers or those aiming to protect A/C and furnace components from common particulates.

It is less suitable for households requiring hospital-grade filtration or ultra-fine particle capture; those needing higher filtration efficiency should consider higher MERV-rated or specialty filters. Also, very dusty workshops may still need more frequent changes than the up-to-90-day guideline.

Pros & Cons

Pros

• Made in USA construction gives confidence in materials and manufacturing.
• Pleated design captures more particles than flat filters while preserving airflow.
• Good fit and quality according to customer feedback, reducing installation issues.
• Four filters per pack offers value and convenient spares for routine maintenance.

Cons

• Actual thickness is 0.75 in, which may require careful sizing for tight slots labeled 1 in.
• MERV 8 is not sufficient for medical or industrial filtration needs where higher MERV is required.

Specifications

Brand	Filter King
Pack size	4-pack
Rated MERV	MERV 8
Nominal size	37 in x 16.5 in x 1 in
Actual size	37 in x 16.5 in x 0.75 in
Country of manufacture	Made in USA (EPA Establishment 103501-FL-1)
Recommended change interval	30-90 days

Our Verdict

The Filter King 37 x 16.5 x 1 4-pack is a practical, cost-effective choice for typical homes that need dependable filtration without compromising HVAC airflow. Its pleated MERV 8 media and domestic manufacturing make it a good value for routine maintenance, though users requiring finer filtration should choose higher MERV options.

Frequently Asked Questions

How often should these filters be changed?
Manufacturer recommends every 30-90 days for 1 in filters; change more frequently in dusty environments.

Will MERV 8 affect airflow?
MERV 8 is designed to trap common particles while maintaining normal residential airflow for most systems.

Are these filters actually made in the United States?
Yes, the product is fully manufactured in the USA and lists EPA Establishment Number 103501-FL-1.