How do I find my furnace filter size?

How do you determine furnace filter size?

Almost always, furnace filter sizes are printed on the side of the filter. They are read as Length x Width x Depth. When inspecting furnace filters, homeowners may find two different sets of sizes. First, there is the nominal size expressed in whole numbers.

How do I know what size air filter I need?

Follow these 3 easy steps to measure your HVAC filter size:

  1. Step 1 – Measuring Length and Width (L x W). (If your filter is not a square, the smallest measurement goes first).
  2. Step 2 – Measure the thickness (Depth) of your filter from front to back.
  3. Step 3 – Put Your measurements together (L x W x D).

How do I know what kind of filter my furnace uses?

To find out what size filter your furnace uses, remove and check the old filter (the size should be written on the frame of the filter) or refer to your furnace manual. NOTE: If your furnace uses a custom size filter speak with your furnace manufacturer to find out where you can purchase replacement filters.

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Do furnace filters have to be exact size?

Your filter or HVAC unit should have both the nominal and the actual size written on it. If you can’t find the actual size, it’s a good idea to measure it just in case. Our website categorizes filters by the nominal size, making it easier to navigate and find your filter.

What happens if you use the wrong size air filter?

When you use the wrong size air filter, or you install it incorrectly, the filter can’t effectively prevent dust from accumulating on the system’s motors and blowers. You’ll end up with a dirty furnace that can’t properly perform, and all of that debris could end up harming the system’s internal components.

What is a standard air filter size?

Standard air filter sizes include:

10X20 14 X 20 20X20
12X12 14X24 24 X 24
12X20 14X25 20X24
12X24 14X30 20X25
12X30 15X20 20X30

How do I know what size air filter I need without a filter?

Actual Size: The actual size of an air filter is typically written in the fine print on the frame of the filter and is usually 0.25″-0.5″ smaller than the advertised, nominal size. The actual size is what you’d find if you used a ruler to measure the exact dimensions of the filter.

Can you cut furnace filters to fit?

Some manufacturers can even customize the filters for you to fit perfectly when you or your HVAC team puts everything together. Simply put, yes, you can cut an air filter if you know what you are doing, and if the filters you use will not become too weak from the cutting.

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Are air filters true to size?

Since air filters are most often sold by their nominal dimensions, it is crucial to learn how to properly measure your air filter. When making your purchase, you should order your filter by its nominal size, rather than its actual size.

What are the different sizes of furnace filters?

Furnace Filter Size by Model Number and Brand(With Nominal Sizes and Actual Sizes)

Furnace Filter Size (Nominal) Actual Size Good
10x24x1 9.5 x 23.5 x .75 MERV 8
10x30x1 9.5 x 29.5 x .75 MERV 8
12x12x1 11.75 x 11.75 x .75 MERV 8
12x16x1 11.5 x 15.5 x .75 MERV 8

Can I use a 1 inch filter instead of 4?

Question: Can i use a 1 inch filter instead of 4 inches? Answer: If you are okay with more frequent replacement and little stress on the system, 1” filter can be budget-friendly alternative of 4” filters.