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How Outdoor Air Gets Inside

 
How does outdoor air enter a building?
Outdoor air enters and leaves a house by: infiltration, natural ventilation, and mechanical ventilation. In a process known as infiltration, outdoor air flows into the house through openings, joints, and cracks in walls, floors, and ceilings, and around windows and doors. In natural ventilation, air moves through opened windows and doors. Air movement associated with infiltration and natural ventilation is caused by air temperature differences between indoors and outdoors and by wind. Finally, there are a number of mechanical ventilation devices, from outdoor-vented fans that intermittently remove air from a single room, such as bathrooms and kitchen, to air handling systems that use fans and duct work to continuously remove indoor air and distribute filtered and conditioned outdoor air to strategic points throughout the house. The rate at which outdoor air replaces indoor air is described as the air exchange rate.
 
Why does this matter?
When there is little infiltration, natural ventilation, or mechanical ventilation, the air exchange rate is low and pollutant levels can increase.
Link: 
General Filters, Inc. Updates Returns / Warranty Policy
AP-2 Water Conductivity Tester - How to Use
Electrode steam technology relies on water conductivity to work as designed. Prior to selecting a steam humidifier option, it's essential that you test the humidifier's water supply for conductivity. Learn how easy it is using our A-P 2 Water Meter.
GeneralAire 1300 Dehumidifier Discontinued - Effective August 25, 2014
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Why Is Indoor Air Quality (IAQ) so Important?
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Improve Indoor Air Quality For People With Allergies
The World's Biggest Environmental Killer: Indoor Air Pollution
Perfect Platform - A Space Saving MERV 11 Air Filtration Solution
Improving Air Quality In NYC Would Boost Children's Future Earnings
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