Filter King 24x36x1 Air Filter 4-Pack MERV 13 - Made in USA

In this review the Filter King 24x36x1 Air Filter 4-Pack is evaluated for homeowners who want a higher-efficiency replacement for standard 1 in HVAC filters. The bottom line: these MERV 13 pleated filters offer noticeably cleaner air within a few days and are appealing because they are fully manufactured in the United States, but potential buyers should check actual dimensions before ordering since the listed size is slightly smaller than nominal. For those seeking improved particle capture without a complicated installation, these filters are an easy, effective upgrade.

Key Features

• MERV 13 rating: Captures finer airborne particles than lower-rated filters, helping reduce dust, pollen and some smoke from circulating in the home.
• Pleated design: The pleats increase surface area to trap more particles and extend the usable life between replacements.
• Made in USA: Fully manufactured domestically with EPA establishment traceability for customers who prioritize local production.
• 4-pack convenience: Four filters in a single purchase make routine maintenance easier and lower the per-filter cost compared with buying singles.
• Up to 90 day life: Designed to last up to 90 days under ideal conditions, with a recommended 30-90 day replacement window depending on home conditions.
• Simple installation: Open, slide and close installation makes swaps quick and requires no tools or adjustments to existing HVAC housings.

Who It's For

These filters suit homeowners and renters with central A/C and furnace systems who want improved particle capture over basic fiberglass filters and prefer a product made in the United States. They are especially helpful for households with seasonal allergies or increased indoor particulates where a MERV 13 rating provides meaningful benefit.

They are less suited for systems that are sensitive to reduced airflow or for anyone who cannot accommodate the actual filter size listed as 23.5 in x 35.5 in x 0.75 in, since a snug, correct fit is important. Also, customers expecting heavy-duty commercial lifespan should consider thicker filters or professional options.

Pros & Cons

Pros

• High MERV 13 efficiency provides improved particle capture compared with standard 1 in filters.
• Pleated construction increases dust-holding capacity and can extend time between changes.
• Made in the USA with EPA establishment number provided for traceability.
• Sold as a 4-pack which offers good value and ready replacements on hand.

Cons

• Actual dimensions are 23.5 in x 35.5 in x 0.75 in, which some customers find smaller than expected and may require checking fit before purchase.
• Build quality reports are mixed, so while many find the filters well-made, a minority report perceived weakness in construction.

Specifications

Filter type	MERV 13 pleated 1 in
Pack size	4-pack
Nominal size	24 in x 36 in x 1 in
Actual size	23.5 in x 35.5 in x 0.75 in
Made in	United States (EPA Establishment 103501-FL-1)
Recommended change interval	30 - 90 days (up to 90 days)

Our Verdict

The Filter King 24x36x1 4-pack is a practical choice for homeowners who want a higher-efficiency, American-made 1 in filter that improves indoor air quality without complicated installation. It represents good value as a four-pack and will suit most residential HVAC systems, provided buyers confirm the actual 23.5 in x 35.5 in size fits their slot and accept that some users report inconsistent build quality.

Frequently Asked Questions

Are these true MERV 13 filters?
Yes, they are rated MERV 13 and designed to capture finer airborne particles than lower-rated 1 in filters.

What size should I order?
Order based on the actual size of 23.5 in x 35.5 in x 0.75 in to ensure a proper fit; the nominal listing is 24 in x 36 in x 1 in.

How often do they need replacement?
They can last up to 90 days but the recommended replacement interval for 1 in filters is typically 30-90 days depending on household conditions.