1 / 7Filterbuy 13x21.5x1 MERV 11 Air Filter, 4-Pack
Filterbuy 13x21.5x1 air filters are a four-pack of pleated MERV 11 replacements for compatible HVAC equipment. The listing gives the actual filter size as 12.88 x 21.50 x 0.75 inches, so confirm the installed filter dimensions before ordering.
At a glance
- MERV 11 synthetic filter media, the listing claims it captures 95% of dust.
- Electrostatically charged media and 14 pleats per foot are claimed to support particle capture.
- Listing recommends replacing the filter every 90 days for optimal performance.
- Pleated construction with a beverage-board frame and dual wire backing, according to the listing.
Reference price: $53.96
Price checked: Nov 11, 2026
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Pros and cons
Pros
- Four filters are offered as a pack, reducing the need to reorder after each replacement.
- The stated actual size is included, which helps compare the filter against an existing filter or equipment slot.
- Listed compatibility covers several common HVAC devices, including furnaces, air conditioners and heat pumps.
Technical specifications
11 specifications| Brand | Filterbuy |
|---|
| Dimensions listed | 21.5"L x 12.88"W x 0.75"Th |
|---|---|
| Actual size stated in listing | 12.88" x 21.50" x 0.75" |
| Filter shape | Rectangular |
| Mounting type | Slide In |
| Construction | Pleated |
| MERV rating | 11 |
|---|---|
| Compatible devices | Air Cleaner, Air Conditioner, Furnace, HVAC System, Heat Pump |
| Pleats per foot | 14 pleats per foot |
| Material listed | Aluminum, Plastic, Polypropylene |
|---|---|
| Maximum temperature | 200 °F |
What to know before buying
Listing details to confirm
The title uses nominal 13x21.5x1 sizing, while the stated actual size is 12.88" x 21.50" x 0.75", compare the actual dimensions with your equipment's required filter size before purchase. Performance and longevity figures are manufacturer claims, not independently verified.
Who is it for?
A good fit for
- Buyers replacing a rectangular slide-in filter who have confirmed the listed actual dimensions fit.
- Households seeking a MERV 11 replacement filter for listed furnace, air-conditioner, heat-pump or HVAC use.
Less suited to
- Buyers who need a filter matching a different actual size or whose equipment requires 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%
The supplied customer evidence contains an aggregate rating of 4.6 out of 5 stars, but no review count or written feedback. The rating alone does not show what buyers liked or disliked, confirm fit using the stated actual dimensions, especially if your equipment requires a precise size.
Frequently asked questions
What size is this filter?
The listing gives the actual size as 12.88" x 21.50" x 0.75", the title uses nominal 13x21.5x1 sizing. Check your equipment's required dimensions before ordering.
Which equipment is it listed for?
The listing names air cleaners, air conditioners, furnaces, HVAC systems and heat pumps. Confirm the filter size and requirements for your specific equipment.
How often does the listing recommend replacement?
It recommends replacement every 90 days for optimal performance, actual replacement needs may depend on use and equipment.
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