20x25x5 Air Filter vs 20x25x4: What's the Difference?

When it comes to air filters, the 20x25x4 is a popular choice among homeowners and HVAC specialists. However, the 20x25x5 is one inch wider than the other and would not fit in the slot made for the 20x25x4. This means that while the reverse side may work, it could allow too much air to pass through. It's important to understand that all air filters are not the same, and the way in which your HVAC unit will be affected by different filters is not the same either. To help you make the right choice when buying air filters, here are some common misconceptions you should avoid.

When searching for this item, some sites will list it as 20 x 25 x 4 air filters or 20 25 4 filters. If you need a popular air filter size, you can search for a 20x25x1 air filter or just go to the guide and find its link to see all the 20x25x1 air filter purchase options. Most filters clearly recommend how often they should be replaced, usually from one to six months. Washable filters simply need to be rinsed with a garden hose once a month, air dried and put back in place.

In order for ovens and air conditioning units to work efficiently, it is necessary to replace the air filters regularly. A 1-inch filter with less surface space will clog up fairly quickly and will need to be replaced much sooner than a coarser filter. The following table lists the standard size 1 inch, 2 inch and 4 inch deep air conditioner filters for your air conditioner, oven, HVAC and atomic filters. Ideally, store enough air filters in the house to make ordering a simple annual task rather than every two months.

Having extra filters means you never have to worry about whether you or your family is breathing polluted air for days while you wait for a replacement to arrive in the mail.

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