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Furnace Filters for Carrier, Honeywell, Lennox, Aprilaire, AirBear, Trane and over 50 standard 1 inch  2 inch and 4 inch ac filters sizes in MERV 8, MERV 11 and MERV 13. Replacement Furnace Filters also known as Air Filters, Air Conditioner Filters, AC Filters or HVAC Filters. We carry a large variety of common and hard to find Air Filters Sizes. If you need a custom size contact us and we can make most sizes in 48 hour turn around time (business days). Atomic has Original Equipment Manufacturer (OEM) Brands including top name brands from Carrier Enterprises. Carrier Brands include Payne, Toptech, Carrier, and Bryant. We carry the Germicidal Air Purification Filters from Carrier known as the Carrier Infinity air cleaner model or GAPA filters. 

Find Your Furnace Filter Easily

Enter The Filter Part Number or Size from Your Current Filter in the Search, for examples, enter X6670 or 16x20x1 MERV 11, or 16x25x1 to see results.

 

Lennox Furnace filters are among the best filters made and Atomic has a full selection of Lennox air conditioner filters. We carrier Lennox Carbon Clean and Healthy Climate Pureair System Annual Maintenance Kits.  An extensive selection of brands and compatible replacements for Amana, Five Seasons, York, Totaline, Goodman, Electric-air, Honeywell, Air Bear Trion, and Aprilaire are all available. Save money on your furnace filters without having to drive all over town to Homedepot, Lowes or Walmart. Atomic Filters delivered to your door so that you can spend your time on activities you enjoy. 

How to Avoid this Common Mistake and Get the Correct Furnace Filter Size?

The Most common mistake made when ordering filters are ordering the wrong size furnace filter. This is because the size on the filters is not necessarily the actual size of the filter. Filters are sold by nominal sizes which are rounded sizes and usually vary by brand. 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 length width and depth. See air filter image:

Complete List of Furnace Air Conditioner Filters by Size

 

If there is no size on your current AC filter, you can measure the length, width, and 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. 

Related Links

Furnace Filters

16x25x1 Air Filter

Furnace Filters 16x25x1

16x20x1 Air Filter

20x25x1 Air Filters

How to Choose The Right Home Air Filter Everytime

What MERV filter should I use?

1. Find the Right Filter Rating: MERV(Minimum Efficiency Reporting Value) is a rating system for air filters create by ASHRAE(American Society of Heating, Refrigerating and Air-Conditioning Engineers) to measure the efficiency of air filters. Some companies use their own rating system such as Home Depot uses FPR (FILTER PERFORMANCE RATING) and 3M uses MPR (MICRO-PARTICLE PERFORMANCE).
2. MERV 8(comparable to MPR 600 and FPR 5) is a good level to begin to protect air quality in your home. MERV 11( Comparable MPR 1000-1200 FPR 7)and MERV 13(Comparable MPR 1500-1900 FPR 10) are used in superior commercial buildings and in homes with allergy sufferer. MERV 15 and MERV 16 are among the top residential air/furnace filters available.

How do I know what HVAC filter I need?

1. Check Actual Size: Air filters are labeled with the Nominal Size(varies by Manufacturer and Model) which can be a rounded number. For instance a Lennox X6670 filter has a Nominal Size of 16" X 25" X 5" but an Actual Size 15-3/4" X 24-3/4" X 4-3/8". A 16x25x5 from Lennox may not be compatible with a 16x25x5 model from another manufacturer because they may have a different actual size.
2. Measure Actual Size of your current filter. Use a measuring tape and find the LxWxD(Length, Width and Depth of your current filter)
3. Check compatibility by Model Number. Filters may have a list of Models from Various Manufacturers which are compatible with the filter you need. Beware many filters models number are very similar, double check the actual size(true measured dimensions of the filter) to make sure you have the right filter.
4. Find the Right Filter Rating: MERV(Minimum Efficiency Reporting Value) is a rating system for air filters create by ASHRAE(American Society of Heating, Refrigerating and Air-Conditioning Engineers) to measure the efficiency of air filters. Some companies use their own rating system such as Home Depot uses FPR(FILTER PERFORMANCE RATING) and 3M uses MPR(MICRO-PARTICLE PERFORMANCE).
5. MERV 8(comparable to MPR 600 and FPR 5) is a good level to begin to protect air quality in your home. MERV 11( Comparable MPR 1000-1200 FPR 7) and MERV 13 (Comparable MPR 1500-1900 FPR 10) are used in superior commercial buildings and in homes with allergy sufferer. MERV 15 and MERV 16 are among the top residential air/furnace filters available.

What is a MERV 16 filter?

A MERV 16 filter is a highly efficient filter capturing more than 95% of particles in the range from 0.03 to 10 micrometers which each pass through the filter. Lennox make residential MERV 16 filters that can work with Lennox systems and be used as upgrades to specific Carrier, Trion AirBear, and Honeywell systems. MERV(Minimum Efficiency Reporting Value) is a rating system create by ASHRAE(American Society of Heating, Refrigerating and Air-Conditioning Engineers) to measure the efficiency of air filters. MERV 8 is about the Level that begins to protect the air in your home. The higher the MERV rating the more efficiently smaller particles are filtered out of the air with greater efficiency.

How do I know what size filter to buy for my furnace?

1. Check Your Current Filter Actual Size. Filters are labeled by nominal Size which is a round number. The actual size is the true measured dimensions of the filter by Length, Width and Depth. LxWxD for instance a 16x20x1 filter may have a nominal size of 16x20x1 but an actual size of 15.5x19.5x.75. Actual sizes of filters can vary by manufacturer. Some filters may include the actual size on the filter, otherwise you can simply measure to find the actual size of the filter.
2. Check for Filter Model Number. Whole House filters are usually a filter that is about 3 to 6 inches thick. The best way to find a compatible replacement is to find a filter that is compatible with your current filters model number. Lennox filters for instance list compatible filter model numbers for Honeywell, Trion Air Bear and Carrier on the side of their filter.
3. Manually Measure your current filters LxWxD(LengthxWidthxDepth) to get the actual size.

What happens if you put a furnace filter in backwards?

The filter should always be placed in the correct direction for the Air flow. Here is why.
1. Placing the filter in backwards may cause the filter to collapse resulting in air flow going around the filter. Many filters have a wire backing to prevent collapsing against the air flow. The filters first job is to prtect the equipment from dust. Air flow around a filter can damage your system.
2. Air flow in the wrong direction of a filter can create a greater resistance causing a strain on your system. This can increase utilities and shorten the life of your system.

How Often Should I Change My AC Filter?

General pleated AC Filters are changed every 2 to 3 Months Depending on use. Environments with Smoke, heavy dust (ie Desert) or pets may need more frequent air filter changing.

Cheaper flat fiberglass filters may require changing every 30 days and may even be labeled as a 30 day filter.

Whole House AC Filters with a size from Approximately 3 to 6 inches in width can have a life spans as long as 6 to 12 months depending on environmental conditions.

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 length width and depth. See air filter image:

If there is no size on your current AC filter, you can measure the length 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.

Where is the filter on a furnace?

Furnace filters are generally in 1 of these 3 locations.
1. Filter can be located in a blower compartment right before the air handler.
2. Filter can be in a filter cabinet next to furnace between the return vent and the furnace equipment.
3. Filter can be in return vents inside the home usually behind a removable grill.

What are Lennox MERV 16 Filter Sizes by Model?

What are Lennox MERV 16 Filter Sizes by Model
See MERV 16 Filters by Lennox and Maintenance Kits. Click your model to see full details or add to cart below.

X6672 - Nominal size 16" x 25" x 5" ( Actual size 15 7/8" x 24 7/8" x 4 3/8" )
X6666 - Nominal size 17" x 26" x 4" ( Actual size 16-5/8" x 26" x 4" )
X6675 - Nominal size 20" x 25" x 5" ( Actual size 19 7/8" x 24 7/8" x 4 3/8" )
X6669 - Nominal size 21"x26"x4" ( Actual size 20-3/4" x 25-3/4" x 3-3/4" )
X7935 - Nominal size 20"x20"x5" ( Actual size 19-3/4" x 19-7/8" x 4-3/8" )
X8788 - Nominal size 20" x 26" x 5" ( Actual Size: 20" x 25-1/2" x 4 3/8" )
X8789 - Nominal size 17" x 26" x 5" ( Actual 16.31" x 25.47" x 4.31" )
X8790 - Nominal size 20" x 21" x 5" ( Actual Size 20" x 20-5/8" x 4-3/8" )

What is the Best Furnace Filter?

Answer: MERV 13 for 1 inch filters or MERV 16 for Whole House Filters
The best furnace filter or AC filter depends on your HVAC system. MERV is a rating system designed to evaluate filter efficiency. The Higher the MERV Rating the more efficient the filter. If you have 1 inch return vent filters or a 1 inch filter in the furnace, a pleated MERV 13 filter is generally the highest rated filter available for your system. MERV 13 filters are high efficiency filters recommended for allergy suffers. MERV 8 is around the level that begins to protect air quality in the home.

If you have a system that uses a whole house filter you may have an option from MERV 8 up to MERV 16 depending on your HVAC system if you have a system that has an option of a highly efficient MERV 15 filter such as Bryan and Carrier offer in there Germicidal Air Purifiers. Lennox has a MERV 16 Filter option as offer in the Lennox Pureair System which is among the highest efficiency residential filters available and is also recommended by Lennox as an upgrade to specific Carrier, Trion Air Bear, and Honeywell systems.

What are the Most Popular HVAC Filter Sizes?

The furnace air filter sizes chart includes furnace filters sizes for your furnace. Furnace filter sizes for standard and hard to find sizes are included in the list with Actual sizes and MERV options.

Furnace Filter Size (Nominal) Actual Size Good Better Best
10x10x1 9.5 x 9.5 x .75 MERV 8 MERV 11 MERV 13
10x20x1 9.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
10x24x1 9.5 x 23.5 x .75 MERV 8 MERV 11 MERV 13
10x30x1 9.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
12x12x1 11.75 x 11.75 x .75 MERV 8 MERV 11 MERV 13
12x16x1 11.5 x 15.5 x .75 MERV 8 MERV 11 MERV 13
12x18x1 11.5 x 17.5 x .75 MERV 8 MERV 11 MERV 13
12x20x1 11.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
12x24x1 11.375 x 23.375 x .75 MERV 8 MERV 11 MERV 13
12x25x1 11.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
12x30x1 11.625 x 29.5 x .75 MERV 8 MERV 11 MERV 13
12x36x1 11.5 x 35.5 x .75 MERV 8 MERV 11 MERV 13
14x14x1 13.5 x 13.5 x .75 MERV 8 MERV 11 MERV 13
14x15.5x.75 14 x 15.5 x .75 MERV 8 MERV 11 MERV 13
14x18x1 13.5 x 17.5 x .75 MERV 8 MERV 11 MERV 13
14x20x1 13.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
14x24x1 13.375 x 23.375 x .75 MERV 8 MERV 11 MERV 13
14x25x1 13.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
14x30x1 13.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
15x20x1 14.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
15x25x1 14.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
16x16x1 15.75 x 15.75 x .75 MERV 8 MERV 11 MERV 13
16x18x1 15.5 x 17.5 x .75 MERV 8 MERV 11 MERV 13
16x20x1 15.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
16x24x1 15.375 x 23.375 x .75 MERV 8 MERV 11 MERV 13
16x25x1 15.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
16x30x1 15.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
16x32x1 15.5 x 31.5 x .75 MERV 8 MERV 11 MERV 13
17x22x1 16.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
18x18x1 17.5 x 17.5 x .75 MERV 8 MERV 11 MERV 13
18x20x1 17.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
18x22x1 17.5 x 21.5 x .75 MERV 8 MERV 11 MERV 13
18x24x1 17.375 x 23.375 x .75 MERV 8 MERV 11 MERV 13
18x25x1 17.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
18x30x1 17.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
20x20x1 19.5 x 19.5 x .75 MERV 8 MERV 11 MERV 13
20x21.5x.75 20 x 21.5 x .75 MERV 8 MERV 11 MERV 13
20x21x1 19.5 x 20.5 x .75 MERV 8 MERV 11 MERV 13
20x22x1 19.5 x 21.5 x .75 MERV 8 MERV 11 MERV 13
20x24x1 19.375 x 23.375 x.75 MERV 8 MERV 11 MERV 13
20x25x1 19.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
20x30x1 19.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
21.5x23.25x.75 21.5 x 23.25 x .75 MERV 8 MERV 11 MERV 13
22x22x1 21.5 x 21.5 x .75 MERV 8 MERV 11 MERV 13
24x24x1 23.375 x 23.375 x .75 MERV 8 MERV 11 MERV 13
24x30x1 23.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
25x25x1 24.5 x 24.5 x .75 MERV 8 MERV 11 MERV 13
30x30x1 29.5 x 29.5 x .75 MERV 8 MERV 11 MERV 13
30x36x1 29.5 x 35.5 x .75 MERV 8 MERV 11 MERV 13

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Find Your Filter Sizes Easy choose 1" Deep Filters , 2" Deep Filters,  or 4" Deep Filters 

Nominal Vs. Actual Sizes: Finding the Right Air Filter Size

Buying the Correct Size Air Filter- The Most Important Thing to Know 

When you are buying your air filter online most important thing to know is Air Filters have two sizes that you need to understand the Nominal size and the Actual Size. Not understanding these numbers often leads to consumers purchasing a filter that does not fit their Furnace or HVAC system. See the complete list of Air Filters by Size Rating and Brand.

Nominal vs Actual air filter size by Atomic

 

Understanding Nominal Filters Size 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. 

Lennox Air Filter X0851 with Foam strips

Examples of Nominal and Actual Sizes

 Size  Example 1  Example 2
Nominal Size 20x20x1 16x20x1
Actual Size 19.5x19.5x.75 15.75x19.75x.75

 

 Furnace filters should fit securely but should not have to be forced into position. If you have to force the filter into its slot, then it is probably too big. Forcing an improper filter size in a filter can cause it to buckle, damaging the filter or reducing its ability to function properly. Filters are a smaller than their slot to allow for easy replacement. Some HVAC units may need a filter with dimensions that are unique or uncommon. In these cases, a custom filter needs to be ordered.

Find Your Filter Sizes Easy in 1" Deep Filters , 2" Deep Filters, 4" Deep Filters