The integrated cross car structural duct cluster 12 includes two duct closure panels 36 and 38 that are separately molded of a thermoplastic material such as polypropylene or polycarbonate/ABS. Closure panel 36 is attached to the horizontal part of the cross shaped portion 30 and flanges 32 and 34 at one end to provide a second outside wall that closes ducts 22 and 26.