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

The easiest way to identify your AC filter size is to remove the existing filter from its slot and examine the frame of the filter. Usually, the filter size is printed along the edge of the filter’s frame.

How do I know what size furnace filter I need?

Furnace filters are sized by width, length and thickness. The size on the filter is usually expressed in inches (example: 16″x20″x1″). A filter that is the wrong size will typically not fit, or may not stay in place, once installed. The owner’s manual for your furnace should tell you what size you need.

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).
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How do I know what furnace filter to buy?

The easiest way to find out what size filter to get for your furnace is to simply remove your current filter and look at its dimensions. These are typically printed along one of the sides of your filter.

Does furnace filter need to be exact 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 size air filter do I need without a filter?

A) Refer to the label on the filter’s frame.

The easiest way to identify your AC filter size is to remove the existing filter from its slot and examine the frame of the filter. Usually, the filter size is printed along the edge of the filter’s frame.

Is a 4 inch furnace filter better than a 1 inch?

4-Inch vs 1-Inch Furnace Filters

The 4-inch thick air filter has a definite advantage over the 1” filter in terms of longevity, airflow and maximum filtering potential. Thus, if it fits your furnace, then a 4-inch air filter is better than a 1-inch air filter in regards to improving air quality.

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.

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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

Should a furnace filter fit tight?

How tight should a Furnace Filter fit? … Your new filter will need to match this size for the system to run efficiently. It should fit snugly but not so tight that you can’t easily slide the filter in and out.

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.

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

How often should you change your furnace filter?

In general, this is how often changing furnace filters needs to be done: For 1- to 2-inch filters, replace them every 1 to 3 months. For 3- to 4-inch filters, replace them every 6 to 9 months. For 5- to 6-inch filters, replace them every 9 to 12 months.

What does nominal size mean furnace filter?

Nominal Size is the printed, labeled or rounded size of the filter. This size will be displayed on the air filter. This is not the true size of your filter. It is usually a rounded size, for example 16x20x1.

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