Abstract: A duct assembly includes a first rigid duct member having a first face with a first opening therethrough and a first plate slidably coupled to the first face. A long dimension of the first plate exceeds a long dimension of the first opening. The first plate is provided with a first orifice therethrough. The assembly additionally includes a second rigid duct member having a second face with a second opening therethrough and a second plate slidably coupled to the second face. A long dimension of the second plate exceeds a long dimension of the second opening. The second plate is provided with a second orifice therethrough. The assembly additionally includes a rotatable coupler member fluidly coupling the first orifice to the orifice. The rotatable coupler is configured to accommodate relative rotation between the first rigid duct member and the second rigid duct member.