Best answer: What if my furnace filter is too big?

If you purchase a filter that’s too large, it won’t slide into the slot correctly. If the filter is too small, it won’t cover the entire space and may allow dust and dirt to flow past.

What happens if I put the wrong size filter in my furnace?

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.

Can I use the wrong size air filter?

An improperly sized air filter doesn’t do its job. When it’s too small, it lets dust, mold, and other contaminants into your air vents. These then spew into your air, providing air quality problems.

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.

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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.

Can I use a smaller furnace filter?

For most systems you can use a standard sized filter within 5/8-in smaller than the air filter housing. If you are not able to find a standard sized filter within that parameter, you will need to order a custom sized air filter.

Can I use a thicker furnace filter?

The general best practice is to use the thickest air filter you can for maximum efficiency. … Higher MERV ratings work best when the filter is 4” thick or thicker because they trap extremely small particles, which means contaminants will build up quickly on the screen.

What is the most common size air filter?

Currently, the most common size furnace filters are 10×20. But should your system need custom sized air filters, note that we offer custom sizing ranging from 8 x 24 x 1 to 25 x 30 x 1.

How should my furnace filter fit?

The filter must fit snuggly in your furnace.It is important to note that you must have an exact fit for your cabinet -“close enough is not good enough” in these circumstances. A good fit prevents air from slipping around the edges of the filter.

How do I know what size filter my furnace uses?

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.

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What size filter do I need?

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

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