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Routine filter swaps are your secret to a delighted HVAC system. Still, comprehending the most typical air filter size can be a head-scratcher if you’’ re uncertain what the numbers indicate.

When it concerns altering out your air filter, size matters. Our guide assists you get a precise measurement and discover the best suitable for your system.

.How does filter size work?

Filters are identified with three-part measurements. The very first number is its length, the 2nd is its width, and the 3rd is its depth or density.

For example, a filter identified 10” ” X 12 ” X 1 ” is 10 inches long, 12 inches large, and one inch thick. Here ’ s a take a look at some typical filter measurements.

. 10 X 20 X 1 ’’’’14 X 20 X 1”’ ’ 16 X 24 X 1 ’ ’ 18 X 30 X 1 ”.

A filter ’ s promoted size is a little larger than its specific measurements. If you’understand how these 2 sizes relate, you ’ ll constantly get theideal filter.


Stop Reading, Start Talking

.Get in touch with a specialist now! Indications your filter is the incorrect size.

The incorrect size HVAC air filter can jeopardize your entire system. A filter that’’ s too little leaves spaces for air and bacteria to leave. A filter that’’ s too huge can harm the location, triggering a security threat.

Here are some hints that you require a filter swap . If you’’ re still not sure, call an HVAC expert to verify.

.If your filter makes rattling sounds inside your system, it might be too small.If you discover an uptick in dust around your house, your filter might be too little. If you need to jam or require your filter into the slot, it’’ s too huge. If your filter has bent corners when you take it out, it’’ s too huge. Filter real vs. small size.

Manufacturers identify filters with a quote of their real size. This quote is called the small size. If you understand your filter’’ s small size, it will be a universal fit throughout any brand name.


See how small and real sizing relate.

.Real size for filters.

The real size is an air filter’’ s precise size. If you determine your filter’with a ruler, you ’ ll get the real size.


An air filter ’ s real size is typically ¼ to ½ inch less than its small size. To transform from real to small size, determine your filter and round each measurement approximately the nearby inch.

.Small size.

Nominal size is a rounded price quote of an air filter’’ s real size. You ’ ll most likely see the small size printed on the side of your filter.

Filter producers utilize small sizing for market consistency. Real filter sizes differ by brand name, which develops buyer confusion. Small sizing makes comparing comparable items easier.

Once you discover your filter’’ s small size, you can go shopping any brand name with self-confidence. No matter where you remain in your filter shopping journey, we’’ ve got you covered.

.Examine your filter frame for small size.

If your filter is identified, this is a breeze. Turn your thermostat off and eliminate your air filter.

Check the label, which ought to be on the side of your filter. The noted measurements are your filter’’ s small size. Order a filter with the exact same small size from any producer if the filter fits effectively.

If your present filter isn’’ t identified, take manual measurements. Procedure your filter with the actions listed below.

.Procedure your filter.

Use a flat ruler or tape measurer to finish the measurements. Step your air filter’’ s length, height, and density (depth) in inches.


Starting with the length, inspect each private measurement. Assemble to the nearby inch. You can go shopping any brand name that offers your filter’’ s small size, understanding it’’ s a fit.

. Procedure the filter slot.

As a last-resort method to discover the proper air filter size, determine the air consumption criteria. This is the most labor-intensive alternative, and it leaves the most space for mistake. Go with this approach just if you’’ re particular that your existing filter is the incorrect fit.

Find the slot that holds your air filter. It’’ s typically found in the blower compartment or return duct.

Measure the length, width, and depth of the area’’ s inner edge. If you utilize this approach, you’’ ll need to check out the small print for each filter’’ s real size when you shop.

Your filter’’ s real height and width need to determine ⅛ to ⅝ inches less than the slot. If it’’ s the specific very same size or larger, it won ’ t fit effectively.


If your filter beings in a vent instead of moving into a slot, there’’ s less wiggle space. Your filter’’ s real height and width must have to do with ⅛ inch much shorter than its area.

We wish to re-emphasize that small sizing won’’ t be useful with this approach. Every brand name makes filters with a little various real sizes, so examine each filter’’ s specific measurements prior to purchasing.

.Finest filter density.

Most HVAC systems can just fit 1””- thick filters. If yours can accommodate a larger one, select the thickest filter that easily has and fits been advised by your HVAC expert.

Thicker filters can manage more accumulation, so you wear’’ t need to change them as frequently. Plus, a thick filter traps more particles than a thin filter. Be careful. A filter that is too thick can impede air flow, producing functional issues for the devices.

Ultimately, a comfy fit is much more essential than filter density. Jamming in an extra-large filter where it doesn’’ t belong can harm your HVAC system and won’’ t tidy your air correctly.

.Finest air filter size.

Finding the ideal size filter is a simpler procedure than it might appear. Look and listen for hints your existing filter might be under or extra-large.

If the filter fits snuggly, utilize the numbers on the side to pick a replacement every 60 days, or as suggested by the maker. If the filter size isn’’ t printed on the side, take manual measurements. Assemble to the closest inch to produce the small filter size, which is the measurement you’’ ll usage when acquiring a filter .

Changing the HVAC filter is simply one part of the regular upkeep you ought to carry out on your system. Set up a seasonal assessment two times annual to extend the life of your HVAC and boost energy performance.

.Associated Content You May Be Interested In Your Guide to All Furnace Filter Questions How Can I Tell That My Filter Needs to Be Changed? Is a Furnace Filter Washable or Should It Be Replaced? How Do I Know I Am Ordering the Right Filter? What Are the Different Types of Furnace Filters?

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