Duct cleaning generally refers to the cleaning of various heating and cooling system components of forced air systems, including the supply and return air ducts and registers, grilles and diffusers, heat exchangers heating and cooling coils, condensate drain pans (drip pans), fan motor and fan housing, and the air handling unit housing
PREVENTION of duct contamination is KEY to avoiding problems.
• Perform routine preventive maintenance on HVAC systems, by complying with manufacturer schedules for changing HVAC filters, cleaning coils, and other components.
• During building renovation, seal ductwork to prevent construction dust and debris from entering the HVAC system.
• Maintain good housekeeping in occupied spaces.
• Ensure that air intakes are located away from contaminant sources.
• Consider routine inspections of ductwork. The National Air Duct Cleaning Association (NADCA)’s standard, “Assessment, Cleaning and
Restoration of HVAC Systems- ACR 2013,” recommends that HVAC systems be visually inspected for cleanliness at regular intervals, depending on building use. For healthcare facilities, the standard recommends annual inspections of air handling units and supply/return ductwork.
BEFORE hiring a duct cleaning contractor, make sure you can answer “Yes” to all of these questions:
– Are there known or observed contaminants in the ductwork?
– Have you confirmed the type and quantity of contaminants based on testing or observation?
– Are the contaminants (or their by-products) capable of entering occupied spaces?
– Have you identified and controlled the source of contaminant?
– Will the duct cleaning effectively remove, inactivate, or neutralize the contaminant?
– Have you considered other options, such as removal of affected ductwork?