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12 x 24 x 4 Air and Furnace Filters
It's that time of the year again, you need to get a new 12x24x4 filter for your home air conditioner or furnace. But how do you know if you are changing the filter as often as you should? Besides the type of filter you are getting, there are also a couple other considerations when it comes to how often you should change it. For starters, if you live in a location that is more prone to dust, you would want to change your air or furnace filter at a more frequent rate than recommended. There are some factors that can lengthen your filter life as well, though. Generally, air filters need to be changed more often in summer months than in winter months (likely because winter leads to snow covering the ground, while in summer there is more dust as well as pollen kicked up). Also, if you do not use the equipment on a regular basis, the filter will not need to be replaced as often – so those spring and fall months without regular heating and cooling in your home will require less attention to the filter. Still, it is important to check it and make sure that it is clean enough to keep your air conditioning or heating system in good working order.
As an added bonus, order today and receive Free Shipping on all air filter orders!
NOTE: Several brand replacements may be listed below. All filters on this page are compatible with each other. Each brand replacement is listed separately to provide you with corresponding part/model numbers for that specific filter.
Click on the + under "Details" below to see complete details about the filter.
Click here to view the Filter Comparison Chart
Enter a Quantity and click the "Buy" button.
| Details | Brand / Actual Size | MERV | Price / Filter | # Filters | Price / Case | Cases |
 | SC40 |
| | A MERV 8 rating will protect your equipment and capture:
- Settling/Average Dust Particles
- Mold Spores
- Dust Mite Debris
- Pet Dander
- Pollen
Captures large amounts of dust and common allergens
Ideal for those with mild allergies
Made with heavy-duty materials to provide a sturdy filter
Available in custom sizes
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| 11‑3/8" x 23‑3/8" x 3‑3/4" | MERV 8 | $11.00 | 3 | $33.00 | |
| Details | Brand / Actual Size | MERV | Price / Filter | # Filters | Price / Case | Cases |
| Baking Soda |
| | A MERV 8 Baking Soda Pleated Filter is recommended for mild odors and will protect your equipment and capture:
- Settling/Average Dust Particles
- Mold Spores
- Dust Mite Debris
- Pet Dander
- Pollen
Take a look at the features below to see if a Baking Soda Air Filter is a good choice for you!
Sodium Bicarbonate-Infused media to help neutralize common household odors Captures large amounts of dust along with common allergensIdeal for those who want to freshen the air and deodorize mild odorsAlso suitable for those with mild allergies
Made with heavy-duty materials to provide a sturdy filter Not available in custom sizes
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| 11‑3/8" x 23‑3/8" x 3‑3/4" | MERV 8 - Baking Soda | $12.50 | 3 | $37.50 | |
| Details | Brand / Actual Size | MERV | Price / Filter | # Filters | Price / Case | Cases |
| Activated Carbon |
| | A MERV 8 Activated Carbon filter is recommended for severe odors and will protect your equipment and capture:
- Settling/Average Dust Particles
- Mold Spores
- Dust Mite Debris
- Pet Dander
- Pollen
- Tobacco Smoke
* Best recommended filter specifically for the removal of smoke odor from tobacco or fire and other severe and objectionable odors from fumes, gases, and chemicals
Effectively removes severe odors from tobacco smoke, pets, chemicals, gases, and other strong household odors
Captures large amounts of dust and common allergens
Ideal for those who need to control serious odors
Also suitable for those with mild allergies
Made with heavy-duty materials to provide a sturdy filter
Filter fragrances are not recommended as carbon absorbs fragrances
Not available in custom sizes
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| 11‑3/8" x 23‑3/8" x 3‑3/4" | MERV 8 - Carbon | $16.00 | 3 | $48.00 | |
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