1 / 7Simply SF-12181-M08-6PK MERV 8 Air Filter, 12×18×1, 6-Pack
Simply SF-12181-M08-6PK is a MERV 8 pleated air filter sold as a six-pack for compatible AC, furnace, and heat-pump systems. Its listed dimensions are smaller than the nominal 12×18×1 size, so compare the actual measurements with your filter slot before ordering.
At a glance
- MERV 8 pleated filtration, the listing names dust, mold, pet dander, and pollen among captured particles.
- Nominal size is 12×18×1, the listed actual dimensions are 11.75 × 17.75 × 0.75 inches.
- Manufacturer recommends replacement at intervals of up to three months, depending on use.
Reference price: $49.99
Price checked: Nov 12, 2026
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Pros and cons
Pros
- Six filters are supplied, reducing the frequency of reordering compared with a single-filter purchase.
- Pleated synthetic media and the MERV 8 rating offer a defined filtration specification for buyers matching an existing system requirement.
- Listed for air conditioners, furnaces, and heat pumps.
Technical specifications
8 specifications| Brand | Simply |
|---|---|
| Model | SF-12181-M08-6PK |
| MERV rating | 8 |
| Pack quantity | 6 |
| Dimensions listed | 11.75"L x 17.75"W x 0.75"Th |
|---|---|
| Compatible devices | Air Conditioner, Furnace, Heat Pump |
| Material listed | Cardboard, Electrostatically Charged Synthetic Pleated Media, Paper |
|---|---|
| Filter construction | 24-Point Beverage Board, Hot-Rolled Steel Wire Mesh, Pleated |
What to know before buying
Listing details to confirm
The nominal 12×18×1 size differs from the listed actual dimensions of 11.75"L x 17.75"W x 0.75"Th, customer feedback also reports mixed fit and size experiences, so compare the filter-slot measurements rather than relying on the nominal label. The listing claims capture of 90% of airborne particles but does not specify the test conditions, and gives an up-to-three-month replacement interval rather than a guaranteed service life.
What’s in the box
Included- 6 air filters
- Installation guide
Who is it for?
A good fit for
- Households replacing a filter in a system that takes the listed actual dimensions and specifies MERV 8.
- Buyers who want several filters on hand for routine replacement in compatible AC, furnace, or heat-pump equipment.
Less suited to
- Anyone whose system requires a different filter size or a filtration rating other than MERV 8.
Customer reviews on Amazon
- 5 stars
82% 82% - 4 stars
11% 11% - 3 stars
3% 3% - 2 stars
1% 1% - 1 star
3% 3%
Customer feedback is broadly favorable: the supplied summary reports positive perceptions of filter quality, dust and allergen filtration, airflow, functionality, and value. It also describes mixed experiences with fit, size, and the purchase experience. The listed actual dimensions make careful slot measurement especially important, the 4.7 out of 5 rating across 55,458 ratings is an aggregate and does not resolve whether this size will fit a particular unit.
Positive themes
- Customers are described as praising quality, filtration, airflow, functionality, and value.
Negative themes
- Some customers reportedly found the filters did not match their units or were smaller than expected, some were dissatisfied with the purchase experience.
Mixed feedback
- Fit and size experiences vary.
Frequently asked questions
What size is this filter?
The nominal size is 12×18×1, while the listing gives actual dimensions of 11.75"L x 17.75"W x 0.75"Th. Measure your slot and compare those actual dimensions before buying.
How many filters are included?
The listing specifies six air filters and an installation guide.
How often does the manufacturer recommend changing it?
The listing says filtration can last up to three months, actual replacement timing can depend on use and system conditions.
Which equipment is it listed for?
The specifications list air conditioners, furnaces, and heat pumps as compatible devices. Confirm the size and filtration requirement for your particular unit.
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