What are air filter sizes?

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.

Are air filters different sizes?

Unfortunately, that’s not the case – there are about 20 “standard sizes” for air filters, and none have the same measurements. Why is getting a correctly sized air filter so important? 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.

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.

How thick is a 2 air filter?

High Quality Replacement 2 Inch Air Filters

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Our 2 inch thick air filters come in a variety of popular and customizable sizes and provide four different MERV ratings for your choosing.

Can I use a 4 inch filter instead of 5?

Going down in thickness by an inch shouldn’t be a big deal – for example, you should be able to use a 4-inch filter instead of a 5-inch filter. … 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.