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.
Does air filter have 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.
How do I know what air filter to buy?
Simply, you need the filter size that fits in your air return. You can typically find that size on the side of the air filter that you already have in use. This size will be the nominal size, which means it is rounded from its actual size.
How do I know what size filter to buy for my furnace?
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.
What if my air filter is too big?
Air Filter Problems with Poor Fit
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 is the most common air filter size?
What Are the Most Common Air Filter Sizes
- 20 x 25 x 1.
- 20 x 25 x 4.
- 16 x 20 x 1.
- 16 x 25 x 4.
- 20 x 30 x 1.
- 12 x 12 x 1.
- 14 x 14 x 1.
- 14 x 20 x 1.
Are all car air filters the same size?
Air filters are specific to engine size, and each model of a car can have various engine sizes, so be extra careful when you are looking up this information. You can find this information in your car owner’s manual or online.
How do you read a filter size?
The size of your pleated air filter is always presented in a string of three numbers, with the first number representing the length, the second number representing the width, and the last number representing the thickness. If you’re still not sure what size filter(s) your home needs, feel free to reach out to us.
What MERV rating air filter should I use?
In general, the best MERV rating for a home is somewhere between 8-10. These filters will capture a large portion of the airborne particles and improve indoor air quality without making your energy costs rise significantly.
What is the standard home air filter size?
For example: 16x20x1, 20x20x1, 16x25x1, 20x20x1 are all standard sized air filters. Every unit has a specific sized filter which allows the it to perform correctly and efficiently. Most AC and HVAC units use standard sized filters, but some do require a custom size air filter to be purchased and installed.