Performed a duct cleaning and sanitation on a 2 bedroom apt. All vents and ductwork are clear of dust and debris at this time. System is functioning properly at this time. Recommend duct cleaning every 3-4 years. Performed a 2nd floors dryer vent cleaning. Dryer vent,duct,flex hose and lint trap are all clear of lint and debris at this time. Recommend dryer vent cleaning every 1-2 years. Thank you for your business! This is a billout.