There are several key factors to consider when buying a merv 13 filter, including the MERV rating, CADR rating, dust holding capacity, and abrasion resistance. We will discuss the different sizes and types available for air filters and how you can ensure that you are getting the right one.

merv 13 filter

MERV rating

The MERV rating of an air filter is a measure of how well they can remove different sizes of particles. It is generally recommended to choose a filter with a MERV rating of 11 or higher. Filters with a MERV rating between 12 and 13 are half as effective. You can check the MERV rating of air filters by looking at the size of your current filter or by checking the filter holder. Residential air filters are usually rectangular in shape with a width or length.

CADR rating

The CADR rating is a measure of the amount of particulate matter that a certain air filter can remove. This figure is different for various sizes of particles. The smaller dust particles are less than the larger ones. This is why the CADR rating of smoke filters is higher that those for dust and pollen filters. Mold spores or pollen can contain larger particles.

Dust holding capacity

It is important to know how much dust an air filter can hold before you buy it. Fortunately, there are standards that determine the size and strength of these elements. The ISO 16890 standard defines the dust holding capacity for air filters. The standard specifies four different dusts.

Arrestance rating

An air filter’s arrestance rating is its ability to remove larger particles from air. It describes how well the filter can trap ASHRAE and other particles. The dust holding capacity of standard dust filters without exceeding it is the resistance. Air filters are generally rated according their ability to remove larger particles. E3 is better for larger particles while E2 is better for medium-sized particles like dust and lint. Particle sizes are usually expressed in microns.


Filtering costs are often divided into two categories: disposal and purchase price. The purchase price is the initial investment in the filter. The disposal cost is the amount you spend to dispose of the filter once it has served its purpose. The fan works while the filter is in use and consumes energy. Fouling leads to increased resistance to flow, increasing the cost of operating the filter. HVAC filters have a life expectancy of less than one year.

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