Filter King 4.5x23.5x1 Air Filter 4-Pack - MERV 8 Pleated Filters

In this review the Filter King 4.5x23.5x1 Air Filter 4-pack is evaluated for homeowners and renters who need a reliable, easy-to-install replacement for 1 in HVAC slots. The single biggest reason to buy is the practical combination of a MERV 8 pleated design and consistent sizing that fits standard narrow filter slots while capturing everyday airborne particles; customers quickly notice improved dust control and fresher indoor air after installation.

Key Features

• MERV 8 rating: Provides effective capture of common airborne particles such as dust and pet dander without significantly restricting airflow.
• Pleated construction: The pleated media increases surface area to trap more particles and extend the filter life compared with flat panel designs.
• Actual size accuracy: Marked as 4.5 in x 23.5 in x 1 in with an actual thickness of 0.75 in, it fits narrow slots where exact dimensions matter.
• Made in USA: Fully manufactured in the United States under EPA establishment number 103501-FL-1, reflecting domestic production standards.
• Long replacement window: Rated to last up to 90 days, offering flexible maintenance intervals of 30 to 90 days depending on household conditions.
• Simple installation: The open, slide and close approach makes replacement quick and reduces the chance of improper installation.

Who It's For

This 4-pack is best for homeowners or renters with HVAC systems and narrow filter slots who want a balance of particle capture and airflow for typical households, including those with light pet hair or seasonal dust. It suits people who prefer buying replacement filters in multi-packs to reduce shopping frequency and maintain consistent indoor air quality.

Those needing HEPA-level filtration for severe allergies or medically vulnerable occupants should look elsewhere, as a MERV 8 filter does not provide hospital-grade filtration. Also, buyers who require non-standard sizes or thicker filters should confirm fit before purchasing.

Pros & Cons

Pros

• Good particle capture for everyday dust and pet dander thanks to the MERV 8 pleated media.
• Customers report a noticeable improvement in indoor air quality within days of installation.
• Four filters per pack and an up-to-90-day suggested life make this a convenient, value-oriented option.
• Made in the USA with traceable EPA establishment information for quality assurance.

Cons

• Actual thickness is 0.75 in, which may cause fit issues in systems expecting a full 1 in thickness for optimal sealing.
• Some users report occasional difficulty during installation, so careful handling is advised.

Specifications

Brand	Filter King
Model size	4.5 in x 23.5 in x 1 in (actual 0.75 in)
Pack quantity	4 filters
MERV rating	MERV 8
Construction	Pleated filter media
Country of manufacture	Made in USA (EPA Establishment 103501-FL-1)
Recommended replacement	Every 30 - 90 days

Our Verdict

The Filter King 4.5x23.5x1 4-pack is a practical, value-conscious choice for typical homes that need dependable dust and particle control without sacrificing airflow. Its MERV 8 pleated design and domestic manufacturing make it a sensible purchase for most HVAC systems that accept narrow filters, though buyers should verify the 0.75 in actual thickness if a tight seal is required.

Frequently Asked Questions

How often should these filters be changed?
They are rated for up to 90 days, but the recommended interval is 30 to 90 days depending on household conditions and system use.

Will these fit a 1 in filter slot?
The nominal size is 1 in thick but actual thickness is 0.75 in, so confirm your system tolerances if a full 1 in fit is required for proper sealing.

Do these filters reduce pet odors?
They help control pet dander and dust which can reduce some odors, but they are not designed as specialized odor filters.