How to Find the Perfect Replacement AC Filter for Your System

If you have a heating, ventilation and air conditioning (HVAC) system with an air filter, it is essential to check its size to make sure you can get the right replacement. Most filters have the sizes listed on the side, including the length, width, and depth in inches. They usually appear in that order. A higher MERV rating indicates that the filter better maintains air quality and eliminates environmental contaminants.

If you don't have an air filter in your oven, or if your current filter doesn't fit properly, you'll need to measure the duct opening. When you buy air filters, you'll see the words “nominal size” and “actual size” together. The nominal size is the size listed on the package, but you'll have to actually measure the filter that's currently inserted to find the actual size. You should round to the nearest inch to find the right size for the replacement filter.

It needs to fit snugly into the air filter compartment, leaving some space around the edges. We suggest that you physically measure the old filter and its space in the unit to confirm if there is a compatible range of actual dimensions. If an air filter is too small, air gaps will be created and contaminants will bypass the filter material. Rensa Filtration is a family of air filtration companies that manufacture and market best-in-class solutions to ensure the safety of people and the prosperity of industries.

Just like when you measure the filter itself, the air filter slot will be the same size as the actual filter, not the size of the replacement that is needed. Filterbuy reports that 70% of their sales are from 10 of the most common air filter sizes. To make sure you get a compatible replacement for your system, it's important to understand how to measure your current filter and determine what type of filter you'll need.

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