Dirty round, rectangular or spiral ducts are breeding grounds for mold spores, bacteria, dust, pollen, viruses and other harmful deposits. The AQ-R1500 Duct Cleaner makes duct cleaning a simple, one-person operation. It is ideal for cleaning ducts 4"-18" (100-460mm) I.D. round or spiral and 4"-16" (100-410mm) rectangular/square in air conditioning, heating, ventilation and exhaust systems. The AQ-R1500 uses a cleaning brush mounted to the tip of a flexible shaft. A high air displacement vacuum - like our AQ-V-2M model - connected to the duct, removes deposits as they are loosened.