In addition to normal accumulations of dust and dirt found in all homes through regular use, there are several other factors that can increase the need for air duct cleaning:

• Pets
• Occupants with allergies or asthma
• Cigarette or cigar smoke
• Water contamination or damage to the home / HVAC system
• Home renovation or remodelling projects

Some occupants are more sensitive to these contaminants than others. Allergy and asthma sufferers, as well as young children and the elderly tend to be more susceptable to the types of poor indoor air quality that air duct cleaning can help to address.