...
so
as a direct result of dirty duct systems. In fact, as
many as half of all illnesses are either caused or aggravated
by indoor air pollution. According to the US EPA, indoor
air can be up to 70 times more polluted than outdoor air.
What
causes SBS problems? Almost 80% of SBS problems are caused
by either inadequate ventilation, a source of pollution
or both. Inadequate ventilation is usually pretty straightforward
to fix. A pollution source can be external to the building
or within the building itself (including the ventilation
system duct work). Building operations personnel have
little or no control over external pollution sources and
usually must resort to special filters or other solutions.
Internal pollution is a little easier to deal with, especially
a contaminated duct system.
Building
operations personnel have two choices when a contaminated
duct system is discovered: