Air Purifier Filters

Written by Norene Anderson
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Air purifier filters have been designed to capture and contain for elimination all kinds of pollutants and allergens. Nearly 13 percent of the people in the United States suffer from chronic sinusitis. That amounts to nearly 40 million people. Billions of dollars are spent every year on medication and treatment for sinusitis. Over 17 million individuals are treated for asthma.

With these numbers on the rise over the past decade, it is important to take measures to reduce the allergens in the home. One way to provide clean air indoors is to use an approved air filtering system. Whole-house units have filters to catch the pollutants that can harm the heating and cooling unit. These filters may not be sufficient to capture the tiny particulates that cause an allergic response to sensitive individuals.

Ratings for Air Purifier Filters

In order for air purifier filters to be effective, they should be rated at least a MERV 11. MERV (Minimum Efficiency Reporting Value) is a system for rating air filters established by standard 52.2 of ASHRAE (American Society for Heating, Refrigeration, and Air Conditioning). It defines the size of infiltrate the air filter will remove from the air. The higher number is indicative of better filtration. A MERV 11 or MERV 12 rating is recommended for furnaces.

Before replacing the furnace filter, determine the type of pollutants and contaminants to be removed. If odors or inhalants such as smoke, dust, or perfumes are a problem, the use of an air purifier filter with a layer of charcoal may be required. Electrostatic filters are effective for attracting dust and holding it for removal. Combination filters may contain electrostatic fibers and charcoal.


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