Furnace Filter Size Chart for 2024
Standard 1 Inch Furnace Filters
1 Inch Air Filters also known as Furnace Filters, HVAC Filters, Air Conditioner Filter and AC Filters. Atomic brand filters are made from Quality materials in The USA. Made in the USA Filters are made of synthetic material and pleated for optimal air flow. Air filters with a Nominal Size of 1 inch thick air filters have an actual size of .75 inches. MERV 8 air filters use Mechanical filtering to filter out particulate from the air flow. MERV 11 and MERV 13 air filters use Triboelectric(or electrostatic properties in addition to mechanical means to filter the air flow.
Air Filter Size Chart
Find Your Filter Sizes Easy in 1" Deep Filters , 2" Deep Filters, 4" Deep Filters See the complete list of furnace filters by Size Brand and MERV.
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Find Your Furnace Filter by Brand
Click the link for the brand to see the entire collection. Use the search to find your item by Model, Title or Size.
| Whole House Filters by Brand | Model | Size | Actual Size |
| Lennox Furnace Filters | See all | ||
| Lennox MERV 16 Filters Sizes | |||
| Lennox X6672 | 16x25x5 | 15 7/8" x 24 7/8" x 4 3/8" | |
| Lennox X6666 | 17x26x4 | 16-5/8" x 26" x 4" | |
| Lennox X6675 | 20x25x5 | 19 7/8" x 24 7/8" x 4 3/8" | |
| Lennox X6669 | 21x26x4 | 20-3/4" x 25-3/4" x 3-3/4" | |
| Lennox X7935 | 20x20x5 | 19-3/4" x 19-7/8" x 4-3/8" | |
| Lennox X8788 | 20x26x5 | 20" x 25-1/2" x 4 3/8" | |
| Lennox X8789 | 17x26x5 | 16.31" x 25.47" x 4.31" | |
| Lennox X8790 | 20x21x5 | 20" x 20-5/8" x 4-3/8" | |
| Honeywell Furnace Filters | See all | ||
| 16x20x4 FC100A1003 | 16x20x4 | 15 7/8" x 19 7/8" x 4 3/8" | |
| 16x25x4 FC100A1029 | 16x25x4 | 15 7/8 x 24 3/4 x 4 3/8 | |
| 20x20x4 FC100A1011 | 20x20x4 | 19 7/8" x 19 7/8" x 4 3/8" | |
| 20x25x4 FC100A1037 | 20x25x4 | 19 7/8" x 24 7/8" x 4 3/8" | |
| Aprilaire | See all | ||
| Carrier / Bryant | See all | ||
| Carrier 16x20x5 FILXXFNC0017 | 16x20 | 15 1/2" x 19 7/8" x 4 1/8" | |
| Carrier 16x25x5 FILXXCAR0016 | 16x25 | 15 3/8” x 25 1/4” x 5 1/4” | |
| Carrier 20x20x5 CMF2020 | 20x20 | 20 3/4” x 20 1/4” x 5 1/4” | |
| Carrier 24x25x5 FILXXCAR0024 | 24x25 | 23 3/4 x 24 3/4 x 4 3/8 | |
| Carrier 20x25x5 FILXXCAR0020 | 20x25 | 20 1/4” x 25 3/8” x 5 1/4” | |
| Carrier MERV 13 Germicidal | |||
| Carrier PGAPXCAR1620 | 16x20x3 | 17.3x19.9x2.6 | |
| Carrier PGAPXCAR1625 | 16x25x3 | 17.3" x 24.9" x 2.6" | |
| Carrier PGAPXCAR2020 | 20x20x3 | 21.0" x 21.9" x 2.6 | |
| Carrier PGAPXCAR2420 | 24x20x3 | 24.5 x 21.9 x 2.6 | |
| Carrier PGAPXCAR2025 | 20x25x3 | 20.9" x 24.9" x 2.6" | |
| Carrier MERV 15 Air Purifier | |||
| Carrier GAPCCCAR1620 MERV 15 | 16x20 | 17-1/8" x 21-1/2" x 3 5/8" | |
| Carrier GAPCCCAR1625 MERV 15 | 16x25 | 17 1/16" x 24 3/8" x 3 5/8 | |
| Carrier GAPCCCAR2020 MERV 15 | 20x20 | 20 3/4" x 20 1/2" x 3 5/8 | |
| Carrier GAPCCCAR2025 MERV 15 | 20x25 | 20 3/4" x 24 3/8" x 3 5/8" | |
| Carrier GAPCCCAR2420 MERV 15 | 24x20 | 24-1/4 x 21-5/8 x 3-1/2 | |
| Toptech | See all | ||
| Totaline (Goodman) P102-1620 | See all | 16x20x5 | 15-3/8" x 21-7/8" x 5-1/4" |
| Totaline (Goodman) P102-1625 | 16x25x5 | 15-3/8 x 25-1/2 x 5-1/4 | |
| Totaline (Goodman) P102-2020 | 20x20x5 | 20-1/4"x20-3/4"x5-1/4" | |
| Totaline (Goodman) P102-2020 | 20x25x5 | 20-1/4" x 25-3/8" x 5-1/4" | |
| Trion Air Bear | See all | ||
| Skuttle | See all |
Nominal Filters Size: Understanding Filter Sizing Could Save You Time and Money
Not understanding the Nominal Filter Size is the primary culprit for incorrectly purchased filters.The Nominal Size is the usually the dimensions used to Label the filter. For instance 16x20x1. These dimensions are a rounded value on the filters actual measurements. The actual measurements on this filter may be 15.5x19.5x.75, but that could vary by brand and manufacturer. So in order to make sure you have the correct size filter, especially if you are replacing with a different brand it is important to confirm the actual size on the filter. When purchasing filters on the internet the Nominal size is usually found in the product title.
Actual Filter Size- The Key to Making the Right Replacement Filter Purchase
The actual size as you might have guessed are the actual dimensions of the filter by length, width and thickness. This size is often on the filter right below the Nominal size and is usually labeled as the actual size. When you are buying a filter online the actual size is sometime in the product bullet point or the product description. If your filter does not have actual dimensions on the outside of the filter, you can measure you filter to get the correct dimensions. Some brands have a foam gasket on the outside of the filter, in this case, you will want to make sure you have a compatible actual size and that it also has the foam to ensure a snug fit.
Related Furnace Filter Guides
Furnace Filters
16x25x1 Air Filter
16x20x1 Air Filter
20x25x1 Air Filters
How to Choose The Right Home Air Filter Everytime
Buy a Replacement Air Purifier
How Do I Find the Size of My AC Filter?
You can usually Find the Size of Your Air Conditioner filter right on the size of the frame of the filter. The Picture of this 12x12x1 inch air filter has the Nominal size which is the size by which air filters are generally sold. on the right of the filter it also includes the actual size of the filter which are the true measures dimensions of the filter by lenght width and depth. See air filter image:
If there is no size on your current AC filter, you can measure the legnth width depth of the filter and the filter to find the Actual Size of your filter with the Corresponding Furnace Filter size in the Furnace Filter Size(Nominal Size) Chart.
What is a MERV Filter?
MERV is a not a brand or type of filter but scale for ranking air filters based on their particle removal efficiencies. MERV stands for the Minimum Efficiency Reporting Value. The MERV scale ranges from 1 to 20.
Is MERV 8 a Good Filter?
According to the EPA, most home HVAC systems use a low MERV (1-4) fiberglass furnace filter that has a nominal size of 1” thick. Upgrading this AC filter to a medium efficiency filter (MERV 5-8) can have a significant effect on improving the air quality in your home. MERV 8 being at the top of this scale would be a good choice for improving the air quality in your home. For allergy suffers a higher MERV filter would be a better alternative.
What is a Good Allergy Filter?
When it comes to smaller particles that can irritate allergy suffers, higher efficiency filters (MERV 9-12) will work even better at improving air quality. What does MERV 11 mean. MERV 11 is a superior residendial air filter which will filter a very high percentage of particles as small as 3.0 to 1.0 μm each time the air passes through the filter. This includes particles such as Legionella, Humidifier dust, Lead dust, Milled flour, Auto emission particulates, and Nebulizer droplets.
Is A Higher MERV Rating Better?
A true high efficiency filter (MERV 13-16) can reduce indoor particles by as much as 95 percent. Filters with a High Efficiency Particulate Air (HEPA) rating, (or MERV 17-20) are the most efficient. You may need to consult with a local heating and air technician or the manufacturer of your central air system to confirm which (or if ) high efficiency filters will work with your system. If you can’t switch to a more efficient filter, running the system continuously by switching the thermostat fan from “Auto” to “On” has been shown to reduce particle concentrations by as much as 24 percent.
Furnace Filters Air Flow Direction
The Air flow arrow on the side of your filter indicates the correct air flow direction of the air entering your furnace equipment. The correct direction of the arrow is facing away from the return duct that carries the air in need of heating or cooling and toward the HVAC equipment.
Air enters the front of the filter and exists the back of the filter which faces the furnace or HVAC. Air filters were initially designed to protect your expensive HVAC equipment. Even through there are now filters also meant to protect air quality the filter is located before to equipment to protect your system. Air filters usually have support on the back side of the filter which is the direction of the air flow from the front of the filter to the back.Many filters will have metal wire on the back of the filter.
What Happen if the Filter is Backwards?
The furnace filter was designed for the air to flow in one direction which is why many filters have metal wire on the back of the filter to prevent the filter from collapsing. A filter installed backwards will restrict air flow in your air handler causing the system to work harder to make up for the decreased airflow.
What happens if you put an air filter in the wrong direction is your furnace is forced to blow air through the non-porous end of a filter. More energy will be required to move air through the system. The blower will be overworked increasing the energy cost for your heating and cooling. This could also have long term effects on the life of your HVAC system.
What Filter do you need. Leave us a comment or contact us and we will help you find your filter.