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21x - 23x Inch Air Filters

21 inch high ac filter21 - 23 Inch High Air Filters

16x_x_  inch and 17x_x_ air filters in various widths.  


Save with our Filter 6-packs. Most filters are bundled into 6-packs so the price you see is the price for all 6.
These filters have actual height measurements between 20.5"-22.75" on the smaller side. We also have 21 to 23 inch square filters and other filter sizes.

Most replacement air filters are 1" deep, but we also offer air filters that are 2" deep, 4" deep for residential units and up to 5" or 6" thick for commercial a/c and furnace units.

Actual side dimension of a 21" filter is usually 20 5/8" or so, but they are referred to as 21" filters.

Same goes for the 22" and 23" filters regarding the difference between stated size (nominal) as marked on the 22 inch high ac filterside of the filter and the actual filter dimension which is less.

23 inch tall air filter furnaceFind the 21"x, 22"x or 23"x filter size stamped on the side of your old filter cartridge or measure the length and width of your existing furnace a/c filter.

Once you find the right size, you will find additional options to select the MERV rating you would like between MERV 6, 8, 11,13.  Higher MERV rated filters are recommended for homes with pets.

Get the best deals on quality furnace filters made right here in the U.S.A. at Filters Outpost.

21x21x1 21x22x1 21x24x1
22x20x1 22x22x1 22x24x1
23.5 x 23.5 x1 24x24x1 24x30x1

Many of the 21", 22" and 23" filters offered in this section have SAME DAY SHIPPING if ordered before 1:00 p.m EST.

The bulk 6-packs include free FedEx ground shipping to anywhere in the continental U.S.A. too!

Most Popular and Best Selling 21" to 23" home air furnace filters and air conditioner filters