Is Indoor Air Pollution REAL?...Check out the facts:

According to the American College of Allergists-"50% of all health problems are either caused by or aggravated by polluted air."
"Environmental Protection Agency studies show that indoor air may be as much as 100 times more polluted than outside air."
It is estimated that poor air-quality directly results in $1 billion annually in medical costs.
Most people spend 60-90% of their time indoors. In Alaska probably even a higher percentage!
More than 50 million Americans suffer from allergies.
The level of some hazardous pollutants in indoor air has been found to be up to 70 times greater than in outdoor air.

What is Lurking in Your Heating/Cooling Ducts...

A breeding ground for mold, germs, fungi and other harmful microbes.
Dead dust mites and dust mite feces.
Live and dead insect carcasses laying on the duct floor.
An occasional dead bird is not completely uncommon!
Construction debris such as wood chips, drywall, nails and trash...all clogging air-ways.
Pet dander and hair
Dust and drywall dust saturate air-ways and circulate through out the home.
Cooking oil residues stick to duct work and cause odors and help dust to collect inside.

Fires from dryer vents have recently increased by over 15%!
Fire, after fire, after fire, is blamed on lint build up in dryer vent line.
The U.S. Consumer Product Safety Commission (CPSC) estimates that there are 24,000 dryer fires each year in the United States causing over $96 million in property damage.
The CPSC also has issued an alert due to the fact that there are 10 deaths and 310 injuries from dryer exhaust fires annually!
Inadequate maintenance is the leading cause of dryer fires.
Typical lint screens only filter out 75% of lint.
Lint is the material which usually ignites.
When lint builds up in dryer vents, the dryer motor has to labor harder and can overheat thus igniting the lint.
Public Safety News: It is preferable not to use soft flexible ducts for vent piping...Division of Public Safety