1 / 7Filterbuy 18x20x1 MERV 13 Air Filter, 2-Pack
Pack: Filterbuy 18x20x1 MERV 13 Air Filter is a two-filter replacement for compatible HVAC systems. Its listed actual dimensions are 19.5 inches long by 17.5 inches wide and 0.75 inch thick, so confirm the size your unit requires before ordering.
At a glance
- The product title gives a nominal 18x20x1 size. The listing also specifies actual dimensions of 17.50 x 19.50 x 0.75 inches.
- The listing describes electrostatically charged synthetic media and claims 98% dust capture without restricting airflow.
- Manufacturer copy recommends replacement every 90 days, with timing dependent on household conditions and filter size.
- Manufacturer claims the filter is made in the United States.
Reference price: $44.98
Price checked: Nov 14, 2026
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Pros and cons
Pros
- MERV 13 filtration and a two-filter pack are specified, useful for buyers seeking this rating and quantity.
- The listed actual dimensions are supplied to help compare the filter with the existing slot.
- Pleated construction and slide-in mounting are stated in the product details.
Technical specifications
14 specifications| Brand | Filterbuy |
|---|---|
| Model | AFB18x20x1M13pk2 |
| MERV rating | 13 |
| Dimensions listed | 19.5"L x 17.5"W x 0.75"Th |
|---|---|
| Weight listed | 15.2 ounces |
| Mounting type | Slide In |
| Shape | Rectangular |
| Airflow direction | Variable |
| Material listed | Aluminum, Plastic, Polypropylene |
|---|---|
| Construction | Pleated |
| Compatible devices | Air Conditioner, Air Purifier, Furnace, HVAC System, Heat Pump |
|---|---|
| Compatible HVAC systems | Commercial, Industrial, Residential |
| Maximum temperature | 200 °F |
| Maximum velocity | 615 cfm |
What to know before buying
Listing details to confirm
The title uses nominal 18x20x1 sizing, while the stated actual dimensions are 19.5"L x 17.5"W x 0.75"Th and feature copy orders them as 17.50 x 19.50 x 0.75. These dimensions align when length and width are reversed, but compare them with your existing filter and slot before buying. The claim of 98% dust capture without airflow restriction is a manufacturer claim, not an independently confirmed result.
What’s in the box
Included- Air filters (2)
Who is it for?
A good fit for
- Buyers replacing a nominal 18x20x1 filter who have confirmed the stated actual dimensions fit their system.
- Households or businesses looking for a MERV 13 pleated replacement and needing two filters.
Less suited to
- Buyers whose system requires a different actual filter size or a different filtration rating.
- Buyers needing independently verified filtration or airflow performance.
Customer reviews on Amazon
- 5 stars
81% 81% - 4 stars
13% 13% - 3 stars
4% 4% - 2 stars
1% 1% - 1 star
1% 1%
Customer feedback reports that the filter works well and brings noticeable results, including mentions of pets, allergies, viruses, and dust. Buyers disagree about value for money. That feedback may help when weighing the stated MERV 13 rating and two-filter pack, but it does not independently establish filtration performance or guarantee results in a particular system.
Positive themes
- Customers report effective operation and noticeable results.
Mixed feedback
- Feedback on value for money is mixed, with some finding it worthwhile and others not.
Frequently asked questions
What are the listed actual dimensions?
The product details list 19.5 inches long, 17.5 inches wide, and 0.75 inch thick. Other feature copy presents the same width and length in reverse order. Compare the measurements with your existing filter and slot.
How many filters are in the pack?
The listing specifies a two-filter pack.
How often does the manufacturer recommend changing it?
The listing recommends replacement every 90 days for optimal performance, while also noting that timing can vary with filter size and household factors.
Which systems does the listing name as compatible?
It lists air conditioners, air purifiers, furnaces, HVAC systems, and heat pumps. Correct sizing is still necessary.
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