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What air filter should I use?

03/17/2011
by Todd Wagaman
Category: Enviroment,

What air filter should I use?

1 - 43.0 - 10.0: less than 20%63.0 - 10.0: 49.9%83.0 - 10.0: 84.9%101.0 - 3.0: 50% - 64.9% 3.0 - 10.0: 85% or greater121.0 - 3.0: 80% - 89.9% 3.0 - 10.0: 90% or greater140.3 - 1.0: 75% - 84.9% 1.0 - 3.0: 90% or greater160.3 - 1.0: 75% or greater

By far the most popular question I get asked is what air filter should I use in my furnace? The answer to that question how much do you want to spend? The next question is how much particles/dust do you want to remove from the air? You get what you pay for, and the best way to understand what your getting for your money is to see how they are rated. Air filters are rated by MERV ratings. The chart below explains how they perform. The most important thing is to change your filter every 30 to 60 days.

What is a MERV rating?
MERV stands for Minimum Efficiency Reporting Value. MERV is a numerical value given to furnace filters in order to identify its filtering abilities. This is now an international industry standard set up by the committee that oversees the furnace filter industry. This standard is used for determining a furnace filter´s ability to capture and hold dirt and dust in specific size ranges.

MERV Rating
Average Particle Size Efficiency in Microns

A human hair is 20-40 microns in size. MERV ratings are determined by adding particles of varying sizes (1-12) into a controlled testing environment. The particles are added upstream of the test filter and a laser particle counter samples the air before it enters the furnace filter and after it leaves the furnace filter. The two particle counts are compared to calculate the Particle Size Efficiency of the tested furnace filter. Once this is determined, a MERV Parameters chart is used to determine the MERV rating.

1 - 4 3.0 - 10.0: less than 20%
6 3.0 - 10.0: 49.9%
8 3.0 - 10.0: 84.9%
10 1.0 - 3.0: 50% - 64.9% 3.0 - 10.0: 85% or greater
12 1.0 - 3.0: 80% - 89.9% 3.0 - 10.0: 90% or greater
14 0.3 - 1.0: 75% - 84.9% 1.0 - 3.0: 90% or greater
16 0.3 - 1.0: 75% or greater

By far the most popular question I get asked is what air filter should I use in my furnace? The answer to that question how much do you want to spend? The next question is how much particles/dust do you want to remove from the air? You get what you pay for, and the best way to understand what your getting for your money is to see how they are rated. Air filters are rated by MERV ratings. The chart below explains how they perform. The most important thing is to change your filter every 30 to 60 days.

What is a MERV rating?
MERV stands for Minimum Efficiency Reporting Value. MERV is a numerical value given to furnace filters in order to identify its filtering abilities. This is now an international industry standard set up by the committee that oversees the furnace filter industry. This standard is used for determining a furnace filter´s ability to capture and hold dirt and dust in specific size ranges.

MERV Rating
Average Particle Size Efficiency in Microns


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1 - 43.0 - 10.0: less than 20%63.0 - 10.0: 49.9%83.0 - 10.0: 84.9%101.0 - 3.0: 50% - 64.9% 3.0 - 10.0: 85% or greater121.0 - 3.0: 80% - 89.9% 3.0 - ....

>> Read More

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