Commercial

Central Air Conditioning issues on Commercial Properties:

	Rectify or prevent "Sick Building Syndrome"
	Minimize absenteeism: "Risk of respiratory infection (colds) is 45% higher among occupants of energy efficient buildings" American Medical Association
	Pollutants from chemicals used by tenants and their operations (salons, photoprocessing, copiers)
	1987 ASHRAE study concluded that maintaining HVAC systems cleanliness would reduce average operating costs by 10 - 25%
	Dirty ducts can result in premature failure of expensive HVAC components
	Common air ducts transport contaminants from tenants (sick occupants, smokers, pets).  Regular sanitizing is essential
	The World Health Organization estimated that 30% of all buildings experience indoor air quality problems

In common space, everything from the occupants shoes and clothing to their mouths and hands are transporting bacteria into the air.  Fibers and chemicals from carpeting and furniture, vapors from cleaning and copier chemicals, and hair, dander and germs are lifted into the air ducts and forced back out onto all the occupants sharing common ducts.  

There are  pollutants which can enter from outside of a building, like automotive exhaust.  The compounded effect of all these contaminants is low indoor air quality.  

Offices and restrooms are cleaned for the safety and comfort of the occupants.  Should air quality be neglected because it can't be readily seen?