Page Comparison

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• The type of filter medium and MERV rating - air filters come in many shapes and sizes, which greatly affects how often a filter needs to be replaced. Find out more in Central Air Systems & Filters.

• How often your central system is on - if you live in a temperate zone, your central system may only be active in the winter. If air isn't moving through your ducts, it's not being cleaned by the filter.

• The indoor sources of air pollution - activities like renovations, cooking, and cleaning can produce harmful pollutants that need to be removed from the air through a filtration system

• The outdoor sources of pollutants - living near a major roadway, or in an area with large amounts of construction work will produce a lot of pollution that can seep into the home, even if the windows are closed.

• The number of pets and how much they shed - most types of pets produce dander (skin flakes) and can carry mites. In addition, indoor/outdoor pets will bring in pollen, mold, dirt, and allergens from outside.

• The number of people in the home and the types of activities of the occupants. New research shows that the human body produces a lot of particles and chemicals that can contribute to poor air quality.

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