Heating Duct and Plenum are contaminated with pathogenic organisms (The duct system is merely the vehicle for the spread of contaminants found within an environment and is rarely if ever the source)
Contaminants Present
Pathogenic Molds Bacteria
Can Cause or Contribute to
Mold Allergies, Respiratory Infection, Allergic Asthma, Sinusitis, ...and other maladies
