Just as there are many sources of air pollutants, there are many methods to clean the air you breathe. We believe that one of the biggest investments you've made in your home can also be the best method of cleaning the air - your central air system.
If you have a central air system in your home, it will typically be comprised of the following elements:
A series of ducts throughout your home to circulate air from the central system
A fan that pushes and pulls the air through the ductwork
Heating and/or cooling elements that change the temperature as the air circulates
A Thermostat that modulates the heating, cooling, and fan functions
A filter medium that is installed in the return air duct, just before the fan and heating/cooling elements
For most people, your central air system will last 5 to 15 years and should undergo annual maintenance from your trusted HVAC (Heating, Ventilation, and Air Conditioning) service company. That's not the case with filters, as particles will load up on the filter over time. For more information on how often you should change your filter, see How often does my filter need to be replaced? .
Most air Filters have a MERV (Minimum Efficiency Rating Value), MPR (Microparticle Performance Rating), or FPR (Filter Performance Rating). MERV is the most commonly used rating system, so that's what will be used to explain filter effectiveness.