A clean air duct and retaining clip assembly for installation on a receiving port includes an assembly with a tubular body and a cuff extending from the tubular body. The cuff has a cuff groove, at least the cuff receivable on a receiving port, and a retaining clip only partially received in the cuff groove so as to secure the cuff and the tubular body to the receiving port. A clean air duct assembled to a receiving port is also disclosed. And a related method of assembling a clean air duct to a receiving port with a retaining clip is disclosed.