Filter King 35.5x35.5x1 Air Filter 4-Pack - MERV 8 Home HVAC Filters

In this review of the Filter King 35.5x35.5x1 Air Filter 4-pack the bottom line is simple: this set is for homeowners or maintenance pros who need a reliable, made-in-USA replacement that balances particle capture and airflow. The reviewer found the pleated MERV 8 media noticeably cleaner-feeling in the home within days and appreciated the accurate sizing and build quality. This review focuses on real-world fit, longevity guidance, and whether the 4-pack is a practical value for routine A/C and furnace maintenance.

Key Features

• MERV 8 Rating: Captures common airborne particles such as dust and pollen while maintaining good airflow for HVAC systems.
• Pleated Design: The pleats increase surface area so the filter traps more particles and extends usable life between changes.
• Made in USA: Fully manufactured in the United States, offering consistent quality and traceability (EPA establishment number provided).
• Actual Size Precision: Pack lists size as 35.5 in x 35.5 in x 1 in with an actual thickness of 0.75 in, which ensures a proper fit for systems sized to that nominal dimension.
• Recommended Replacement Range: Rated to last up to 90 days with guidance to replace every 30 to 90 days for 1 in filters, so users can choose frequency based on home conditions.

Who It's For

This 4-pack is well suited to homeowners, renters, and property managers who want a dependable, mid-efficiency filter for routine A/C and furnace maintenance. The MERV 8 rating is a good compromise for living spaces where particle capture matters but HVAC efficiency must be preserved, and the pack sizing works for larger filter housings that accept 35.5 in panels.

Those who need HEPA-level filtration or have severe allergies requiring medical-grade filtration should look for higher MERV or dedicated HEPA solutions. Also, buyers with nonstandard filter sizes should verify the nominal 35.5 in x 35.5 in dimensions before purchasing.

Pros & Cons

Pros

• Good fit and build quality reported by customers, so installation is straightforward and secure.
• Pleated MERV 8 media improves particle capture without noticeably restricting airflow in typical home systems.
• Made in USA manufacturing provides quality control and clear provenance.
• Four filters per pack offer several months of replacements for many homes when changed on a 30-90 day schedule.

Cons

• Actual thickness is 0.75 in, not a full 1 in, so tight-fitting frames should be checked for compatibility.
• Not intended for environments requiring medical-grade or HEPA filtration.

Specifications

Product Type	Pleated HVAC air filter, 4-pack
Nominal Size	35.5 in x 35.5 in x 1 in
Actual Size	35.5 in x 35.5 in x 0.75 in
MERV Rating	MERV 8
Country of Manufacture	Made in USA (EPA establishment number listed)
Recommended Replacement	Every 30-90 days for 1 in filters

Our Verdict

The Filter King 35.5x35.5x1 4-pack is a practical, well-made option for typical homes and maintenance programs that need reliable particle control without sacrificing airflow. With a pleated MERV 8 media and American manufacturing, it represents good value for routine A/C and furnace filter changes, provided buyers confirm the 0.75 in actual thickness will fit their filter frame.

Frequently Asked Questions

How often should these filters be replaced?
Filter King recommends changing 1 in filters every 30 to 90 days; actual frequency depends on household conditions and system usage.

Will a MERV 8 filter affect HVAC airflow?
MERV 8 is designed to trap particles while maintaining airflow in most residential systems, so normal operation should not be impeded.

Is the listed size exact?
The nominal size is 35.5 in x 35.5 in x 1 in and the actual thickness is 0.75 in, so check the filter slot if you have a very tight frame.