Quick Answer: Do they make a 18 x 20 air filter?

What sizes do air filters come in?

What Are the Most Common Air Filter Sizes

  • 20 x 20 x 1.
  • 16 x 25 x 1.
  • 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.

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.

Can air filter be cut to size?

Answering the Question: Is it okay to cut an air filter to fit? … 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.

Can I use the wrong size air filter?

Using the wrong size air filter won’t necessarily damage your HVAC system, at least not immediately. … Using the wrong size reduces the efficiency of your heating and cooling system. This can quickly add up and becomes more of an apparent issue you’ll likely notice on your next utility bill.

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What is the standard size air filter for House?

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.

Are all home air filters the same size?

Air Filter Sizes for Your Home Can Be Frustrating

Unfortunately, that’s not the case – there are about 20 “standard sizes” for air filters, and none have the same measurements. … Because incorrectly sized (and incorrectly installed) air filters cause air seepage and decrease filter effectiveness.

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 do air filter sizes mean?

All filters are sized two different ways. … The actual size is the exact dimensions with no rounding; whereas, the nominal size is the rounded dimensions of the filter. This means that on 1″ and 2″ air filters, the nominal size does not include the undercut, and the actual size does include the undercut.

Can I stack two 1 inch air filters?

Bottom Line: Putting two filters will not make it last longer but may make you have to replace it earlier, assuming it doesn’t already reduce air flow too much with just the filters.

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What happens if your 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.

Can an air filter be too big?

How Tightly Should My Air Filter Fit? If you have to bend, force, or jam your air filter into place: your filter is too big. On the other hand, if your filter does not come within 1-2 fingers’ width of all four corners of your air system handler’s slot or frame: your filter is too small.

What happens if you put a furnace filter in the wrong way?

When a furnace filter is placed backwards, the fibers can’t do their job properly. This means your furnace has to work harder to generate the same air flow, resulting in increased energy costs. Particles are also allowed to build up irregularly, making the furnace working even harder to draw air.