Most Common Filter Sizes

1" Filters
8x14x1 8x16x1 8x20x1 8x24x1 8x30x1 8x36x1 10x10x1 10x16x1 10x20x1 10x24x1 10x25x1 10x30x1 11½x11½x1 12x12x1 12x15x1 12x16x1 12x18x1 12x20x1 12x24x1 12x25x1 12x30x1 12x30⅝x1 12x36x1 14x14x1 14x18x1 14x20x1 14x24x1 14x25x1 14x30x1 15x16x1 15x19x1 15x20x1 15x24x1 15x25x1 15x30x1 15x30⅝x1 15x35x1 16x16x1 16x18x1 16x20x1 16x22¼x1 16x24x1 16x25x1 16x30x1 16x32x1 17x17x1 17x19x1 17x21x1 17½x17½x1 17½x19½x1 17½x23½x1 18x18x1 18½x22x1 18x24x1 18x25x1 18x30x1 18x36x1 19x21x1 19x22x1 19x27x1 19½x19½x1 19½x21x1 19½x21½x1 19⅞x21½x1 19½x23½x1 20x20x1 20x22x1 20x22¼x1 20x24x1 20x25x1 20x30x1 20x36x1 21x21x1 22x22x1 23x23x1 23½x23½x1 24x24x1 24x30x1 24x36x1 25x25x1
2" Filters
10x10x2 10x20x2 12x24x2 14x20x2 14x25x2 15x20x2 16x16x2 16x20x2 16x24x2 16x25x2 18x20x2 18x24x2 18x25x2 20x20x2 20x24x2 20x25x2 24x24x2 25x25x2
4" & Up Filters
12x24x4 16x20x4 16x25x4 18x24x4 19x20x4 20x20x4 20x24x4 20x25x4 24x24x4 25x29x4 16x20x4½ 16x25x4½ 20x20x4½ 20x25x4½ 16x20x5 16x25x5 20x20x5 20x25x5 20x25x6 16x25x3 20x25x3

Bestsellers

All collection of our best selling filters

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At RememberTheFilter.com, we provide premium HVAC filters designed for homes and businesses. Backed by unmatched quality, expert support, and reliable performance, we’re your trusted partner in clean air.

Improve air quality

Remember your filters to improve air quality.

A dirty, forgotten filter can wreak havoc on your HVAC system and indoor air quality. Shop our best sellers to improve system efficiency and air quality.  

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What MERV Rating Is Right for You?

MERV (Minimum Efficiency Reporting Value) measures how well an air filter captures particles. A higher number means better filtration—but it must still be compatible with your HVAC system. Here's a breakdown to help you choose the right filter for your home or business.

MERV 1–4

Basic protection. Captures larger particles like dust, lint, and pollen. Minimal airflow resistance. Best for older systems or basic residential use.

✔ Highest airflow
✘ Does not trap fine particles

MERV 8

Great balance of airflow and filtration. Captures mold spores, dust mites, pet dander, and pollen. Most common choice for residential HVAC systems.

✔ Good airflow
✔ Effective for everyday air quality needs

MERV 10

Enhanced dust-holding capacity and improved particle removal compared to MERV 8. Traps finer particles like mold spores, hair spray, and fabric fibers.

✔ More efficient than MERV 8
✔ Still maintains strong airflow

MERV 11

Captures smaller particles like auto emissions, smoke, and some airborne bacteria. Ideal for homes with pets or allergy concerns. Moderate impact on airflow.

✔ Great for allergies
✘ May reduce airflow in older systems

MERV 13

Highest residential-grade filtration. Captures airborne bacteria, tobacco smoke, and fine particles. Recommended for asthma, smoke exposure, or medical-grade needs.

✔ Best indoor air quality
✘ Not suitable for all systems without airflow evaluation

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MERV vs. FPR vs. MPR – Filter Rating Comparison

Not all air filter ratings are created equal. MERV (Minimum Efficiency Reporting Value) is the industry standard used by HVAC professionals to rate how well a filter traps particles.

FPR is a proprietary rating from Home Depot, and MPR is 3M's internal system for Filtrete filters. These systems can be inconsistent across brands. That’s why MERV remains the most reliable and universal standard for comparing HVAC filters.

MERV FPR (Home Depot) MPR (Filtrete / 3M) Performance Summary Shop Filters
MERV 1–4 FPR 1–3 MPR 100–200 Basic dust protection; ideal for system protection, not air quality Shop MERV 1–4
MERV 8 FPR 5–6 MPR 600–800 Traps mold spores, dust mites, and pet dander; great all-purpose option Shop MERV 8
MERV 10 FPR 7 MPR 1000–1200 Captures finer particles like hair spray, fabric fibers, and more Shop MERV 10
MERV 11 FPR 8 MPR 1200–1500 Helps with allergies; traps smog, bacteria, and fine particles Shop MERV 11
MERV 13 FPR 10 MPR 1900–2200 Highest residential filtration; removes smoke, viruses, allergens, and bacteria Shop MERV 13
  • Staff Filter Pick

    Understanding MERV Ratings: Better Filtration for Cleaner Air

    The MERV rating (Minimum Efficiency Reporting Value) measures how effectively an air filter removes particles from the air. The rating ranges from 1 to 16, with higher numbers indicating better filtration. For example, a filter with a MERV rating of 8 can capture dust and mold spores, while a filter with a MERV rating of 13 can capture smaller particles like bacteria and smoke. Higher MERV ratings mean cleaner air, which is better for your health and your HVAC system.

  • About RememberTheFilter.com

    WHY CHOOSE RTF?

    Rated Excellent ⭐️⭐️⭐️⭐️⭐️, RememberTheFilter.com delivers trusted filters from leading brands that meet the highest performance standards. Unlike generic suppliers that make their own filters and rely on heavy marketing, we focus on quality you can trust. Our filters are rigorously tested to protect your HVAC system, boost efficiency, and improve air quality.

  • RTF Commercial Services

    RTF Commercial Services offers customized programs and pricing to meet your business needs. We simplify filter management by tracking sizes, offering easy online ordering, and providing dedicated account support. Choose from flexible payment options, including Purchase Order or Credit Card.

    We proudly serve industries such as government, healthcare, education, hospitality, and more. Trust RTF Commercial Services to deliver top-quality filters that ensure clean, healthy environments for your facilities.

  • Custom HVAC Filters Tailored to Your Needs

    Finding the right size filter for your HVAC system shouldn't be a hassle. At RememberTheFilter.com, we specialize in custom-sized filters made to fit your system perfectly—down to 1/8 inch. Say goodbye to ill-fitting, underperforming filters from big box stores or generic suppliers. Choose precision, quality, and durability.

    Our filters are crafted to meet the highest standards, ensuring optimal performance and air quality for your home or business. With easy ordering, fast shipping, and trusted reliability, you can finally get the filter you need without compromise.

Naturalaire Filters

Shop trusted NaturalAire filters at RememberTheFilter.com with free shipping on orders over $50. Upgrade your air quality today!

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6 Key Reasons to Frequently Replace Your HVAC, Furnace, and AC Filters

Replacing your HVAC (Heating, Ventilation, and Air Conditioning) filters regularly is essential for maintaining indoor air quality and ensuring the efficient operation of your HVAC system. Here are six reasons why you should replace your HVAC filters often:

Improved Air Quality

HVAC filters trap dust, pollen, pet dander, and other airborne particles. Replacing them regularly ensures that the air in your home remains clean, reducing the risk of allergies, asthma, and other respiratory issues.

Increased Efficiency

A dirty or clogged filter can restrict airflow, forcing the HVAC system to work harder to circulate air. This not only increases your energy consumption but can also lead to higher utility bills. Regularly changing the filters helps maintain the system's efficiency and can result in energy savings.

Extended HVAC Lifespan

When filters are not changed, dust and dirt can accumulate in the system, leading to overheating and potential breakdowns. Regular maintenance, including filter replacement, can prevent these issues and extend the lifespan of your HVAC system.

Cost Savings

Although replacing filters involves a small upfront cost, it can lead to significant savings in the long run by avoiding costly repairs or replacements due to system failure. Additionally, maintaining system efficiency can reduce monthly energy bills.

Healthy Environment

Regular filter replacement helps to keep the indoor environment healthy by reducing the amount of dust, mold spores, and other pollutants that can circulate within your home or business. This is particularly important for individuals with compromised immune systems or respiratory conditions.

Enhanced Comfort

Regularly replacing your HVAC filters ensures consistent airflow and temperature control, enhancing the overall comfort of your space. Clean filters help the system maintain desired temperatures more efficiently and effectively.

AAF Flanders Filters

AAF Flanders Filters

AAF Flanders stands as the world's leading manufacturer of air filtration solutions. With production, warehousing, and distribution facilities spanning 22 countries across four continents, their global reach is unmatched. The company is dedicated to safeguarding people, processes, and systems by designing and producing the finest filtration equipment and containment housing in the market today. When it comes to air and furnace filters, AAF Flanders products are truly top-tier.

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Koch Filters

At RememberTheFilter.com, we are proud to offer Koch air filters, a trusted name in indoor air filtration for over 50 years. Koch Filter manufactures a wide range of filtration products designed to protect both people and processes. From residential to commercial and industrial applications, KOCH filters offer one of the broadest selections in the industry, including medium and high-efficiency filters, HEPA filters, pleated filters, carbon and gas phase filters, and more.

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Our range of filters. Check out the selection.

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Nearly 20 Years in Business
Trusted in Filtration

With nearly 20 years online and over 50 years of combined HVAC filter experience, we’re more than just a retailer—we’re filtration experts. As a proud member of the National Air Filtration Association (NAFA), we serve residential, commercial, and government customers across the U.S. Our filters are made in America and sourced from leading manufacturers like AAF Flanders, Koch Filter, and more.

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