A duct coupling system that is capable of coupling two ducts, such as a clothes dryer exhaust duct and a flexible helical clothes dryer duct that is connected to a wall vent. The duct coupling includes a first duct adapter with a first end to concentrically mate with the first duct, and a second end with a plurality of tines to flexibly bend toward the inner surface of the first duct adapter, such that the first duct that is concentrically mated with the first duct adapter is disposed between an inner surface of the plurality of tines and the inner surface of the first duct adapter toward which the plurality of tines flexibly bend.