An air duct assembly comprising: an air duct having an inflated state and a deflated state, the air duct elongate in a longitudinal direction , the air duct including a sidewall that is pliable, the sidewall defining an interior of the air duct and an external area outside the air duct ; an overhead support member in the external area outside the air duct ; at least a first hoop and a second hoop distributed along the length of the air duct, and disposed within the interior of the air duct , the at least first and second hoops each providing the sidewall with support in a radial direction that is substantially perpendicular to the longitudinal direction ; at least a first loop and a second loop disposed within the interior of the air duct and fastening respectively the at least first and second hoops with respect to the sidewall ; characterized by a first hanger coupling at least one of the sidewall , the first loop, or the first hoop to the overhead support member , the first hanger transmitting a first pulling force that subjects the sidewall of the air duct to tension in the longitudinal direction when the air duct is in the deflated state, and a second hanger coupling at least one of the sidewall , the second loop , or the second hoop to the overhead support member , the second hanger transmitting a second pulling force that subjects the sidewall to tension in the longitudinal direction when the air duct is in the deflated state, the first hanger and the second hanger being spaced apart from each other in the longitudinal direction; the first and second hangers each including a clamp gripping the overhead support member to inhibit movement of the first and second hangers relative to the overhead support member. an air duct having an inflated state and a deflated state, the air duct elongate in a longitudinal direction , the air duct including a sidewall that is pliable, the sidewall defining an interior of the air duct and an external area outside the air duct ; an overhead support member in the external area outside the air duct ; at least a first hoop and a second hoop distributed along the length of the air duct, and disposed within the interior of the air duct , the at least first and second hoops each providing the sidewall with support in a radial direction that is substantially perpendicular to the longitudinal direction ; at least a first loop and a second loop disposed within the interior of the air duct and fastening respectively the at least first and second hoops with respect to the sidewall ; characterized by a first hanger coupling at least one of the sidewall , the first loop, or the first hoop to the overhead support member , the first hanger transmitting a first pulling force that subjects the sidewall of the air duct to tension in the longitudinal direction when the air duct is in the deflated state, and a second hanger coupling at least one of the sidewall , the second loop , or the second hoop to the overhead support member , the second hanger transmitting a second pulling force that subjects the sidewall to tension in the longitudinal direction when the air duct is in the deflated state, the first hanger and the second hanger being spaced apart from each other in the longitudinal direction; the first and second hangers each including a clamp gripping the overhead support member to inhibit movement of the first and second hangers relative to the overhead support member. <EOS>