1 / 7Filterbuy 20×20×1 MERV 11 Air Filter, 4-Pack
Filterbuy’s 20×20×1 MERV 11 air filter is a four-pack of pleated replacement filters listed at 19.5 × 19.5 × 0.75 inches actual size. The listing claims electrostatic media for capturing dust and recommends replacement every 90 days, though customer feedback reports widely varying service life and airflow.
At a glance
- Four filters for 20×20×1 nominal-size replacement applications.
- The listed actual dimensions are 19.5 × 19.5 × 0.75 inches. Measure the existing filter and confirm the opening before ordering.
- The listing describes electrostatically charged synthetic media with 14 pleats per foot and recommends replacing the filter every 90 days.
- Manufacturer claims it captures 95% of dust. This is a listing claim, not an independently verified performance result.
Reference price: $39.96
Price checked: Nov 14, 2026
View offerAhead of Black FridayExplore the selectionOften bought together
Pros and cons
Pros
- Four filters in one pack can provide replacements for multiple vents or scheduled changes.
- The stated dimensions and slide-in mounting details help assess fit before purchase.
- The listing identifies compatibility with furnaces, air conditioners, heat pumps, and HVAC systems.
Cons
- Filter replacement timing may vary considerably in practice, and customer feedback also reports mixed airflow experiences.
Technical specifications
15 specifications| Brand | Filterbuy |
|---|---|
| Model | AFB20x20x1M11pk4 |
| MERV rating | 11 |
|---|---|
| Construction | Pleated |
| Airflow direction | Variable |
| Maximum velocity | 615 cfm |
| Claimed dust capture | 95% of dust |
| Dimensions listed | 19.5"L x 19.5"W x 0.75"Th |
|---|---|
| Weight listed | 2 pounds |
| Mounting type | Slide In |
| Shape | Square |
| Material listed | Aluminum, Plastic, Polypropylene |
|---|---|
| Maximum temperature | 200 °F |
| Compatible devices | Air Conditioner, Air Purifier, Furnace, HVAC System, Heat Pump |
|---|---|
| Compatible HVAC systems | Commercial, Industrial, Residential |
What to know before buying
- The listing gives 20×20×1 as the nominal size and 19.5"L x 19.5"W x 0.75"Th as the listed actual dimensions. Customer feedback also includes reports of smaller-than-standard fit, variable airflow, and service life ranging from about three weeks to three months. Check your current filter dimensions and system requirements, and follow the system maker’s filter guidance. The listing recommends replacement every 90 days, subject to conditions such as pets and allergies.
What’s in the box
Included- Air filters (4)
Who is it for?
A good fit for
- People who need four nominal 20×20×1 replacement filters and have confirmed the listed actual dimensions fit their system.
- Households seeking a MERV 11 filter marketed for dust, pet, and allergy-related filtration.
Less suited to
- Buyers whose system requires a different filter size or whose equipment maker specifies a different filtration rating.
Customer reviews on Amazon
- 5 stars
79% 79% - 4 stars
13% 13% - 3 stars
4% 4% - 2 stars
1% 1% - 1 star
3% 3%
Customer feedback describes easy installation, dust and pet-hair reduction, and good perceived value, but reports differ on filter life and airflow. Some say filters last up to three months, while others describe replacement after about three weeks. Size feedback is also mixed, with reports that the filters seem smaller than standard. These experiences make fit and airflow important to verify, especially given the listing’s 19.5 × 19.5 × 0.75-inch actual dimensions and MERV 11 rating.
Positive themes
- Customers report easy installation and effective dust reduction.
Negative themes
- Some customers say the filter seems smaller than standard.
Mixed feedback
- Reports differ on airflow, with some describing little restriction and others reporting severe restriction.
- Reported service life varies from about three weeks to three months.
Frequently asked questions
What are the listed actual dimensions?
The listing states 19.5 × 19.5 × 0.75 inches. Compare those measurements with your current filter and the available slot before buying.
How often does the listing recommend replacement?
It generally recommends replacing the filter every 90 days, while noting that conditions such as pets and allergies can change the interval. Customer feedback reports service life ranging from about three weeks to three months.
Does the listing claim this filter captures dust?
Yes. It claims the MERV 11 synthetic media captures 95% of dust. That is a manufacturer claim, not an independently verified result.
How many filters are included?
The product is listed as a four-pack, and the included-components entry names air filters.
Alternative options
Simply 20x20x1 Air Filter, Merv 8, MPR 600, 4 Pack, Furnace Air Filter for HVAC (Actual Size: 19.75"x19.75"x0.75") DUST, Pet, & Allergy Control
$26.97
Simply 20x20x1 Air Filter, Merv 11, MPR 1000, 6 Pack, Furnace Air Filter for HVAC (Actual Size: 19.75"x19.75"x0.75") DUST, Pet, & Allergy Control
$39.85
Simply 20x24x1 Air Filter, Merv 8, 6 Pack, For Home AC Furnace & HVAC (Actual Size: 19.75"x23.75"x0.75") DUST, Pet, & Allergy Control
$35.97
Simply 15x20x1 Air Filter, MERV 13, 6 Pack, For Home AC Furnace & HVAC (Actual Size: 14.75"x19.75"x0.75") DUST, Pet, & Allergy Control
$49.46
Simply 20x20x4 Air Filter, MERV 13, 2 Pack, Furnace Air Filter for HVAC (Actual Size:19.5"x19.5"x3.63") DUST, Pet, & Allergy Control
$49.47
Filterbuy 20x20x1 Air Filter MERV 13 Smoke & Allergy Defense (2-Pack) | Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 19.50 x 19.50 x 0.75)
$33.98
Amazon Basics 20x20x1 Air Filter 6-Pack, MERV 11 AC Furnace Filters, Dust, Pet, Allergen Control , Electrostatic (Actual Size: 19.75 x 19.75 x .75)
$36.42
Filterbuy 20x20x1 Air Filter MERV 13 Smoke & Allergy Defense (6-Pack) | Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 19.50 x 19.50 x 0.75)
$49.98
Aerostar Air Filter 20x20x1 MERV 8 AC Filter, HVAC, Furnace Filter, 6 Pack | ACTUAL SIZE (19.75 x 19.75 x 0.75) AC Filter, HVAC, Furnace Filter Captures Dust, Lint & Pollen MERV 8 (MPR 600)
$31.93
Filterbuy 20x20x1 Air Filter MERV 11 Pet & Allergy Defense (6-Pack) | Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 19.50 x 19.50 x 0.75)
$43.98
20x20x1 Air Filter 4 Pack, MERV 11 Dust & Pet Dander Defense | Electrostatic Pleate...
$36.99
Filterbuy 20x20x1 Air Filter MERV 8 Dust & Allergy Defense (12-Pack) | Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 19.50 x 19.50 x 0.75)
$59.88
