the drawing figures show a representative configuration for an automotive vehicle engine bay ventilation according to the invention . the engine bay is represented by the numeral 10 and is schematically portrayed in fig1 . the engine bay is bounded at the rear by a dash panel 12 and at the sides by inner fenders 14 and 16 and these are also schematically portrayed . a portion of the hood 18 is shown in fig2 as is the front end 20 of the vehicle . inside the front end 20 and forwardly of the transversely mounted engine 21 is a transverse structural cross - member 22 that joins the inner fenders 14 and 16 across the front of the bay . cross - member 22 has an open area comprising a number of openings 24 , 26 , 28 , 30 , 32 , 34 , 36 , 38 that pass through the cross - member from front to rear . heat exchanger structure is disposed in front of and mounted on the structural cross - member . this heat exchanger structure comprises a radiator 40 for engine 21 , and when the vehicle has air conditioning , it further comprises a condenser 42 . radiator 40 has end tanks 44 , 46 at the sides and a core 48 extending between said sides . the radiator attaches to cross - member 22 at points of attachment 50 . tubes 52 and 54 project rearwardly from the end tanks 44 , 46 to provide for connection to hoses leading to and from the engine . the condenser attaches to the radiator at points of attachment 56 . in the assembled condition , the radiator end tanks 46 , 48 fit to the vertically elongated openings 28 , 30 so that the tubes 52 , 54 can project rearwardly through the respective openings . ducted fan structure , 58 generally , comprising two ducted fans 60 is cooperatively associated with the structural cross - member 22 , radiator 40 and condenser 42 . each ducted fan comprises an inlet cone 62 and a scroll 64 . the ducted fans are disposed directly behind the core areas of the radiator and condenser . each cone 62 has an inlet opening 66 that matches the corresponding openings 32 and 34 of structural cross - member 22 . furthermore , each cone has a circular outlet opening 68 that is generally centrally located with respect to the inlet opening 66 . each scroll 64 comprises a circular inlet opening 70 that fits to the circular outlet opening 68 of the corresponding inlet cone . furthermore , each scroll has an outlet opening 72 that is disposed to the side . each inlet cone further contains a set of three struts 74 that support a motor mount 76 centrally of each outlet opening 68 . an electric motor 78 is fitted to each mount and projects rearwardly to fit inside the corresponding scroll when the parts are assembled . the motor shaft 80 points to the rear and a fan 82 is disposed within the corresponding scroll and attached to shaft 80 . with this arrangement the ducted fan structure is disposed on the engine bay side of the heat exchange structure and encloses the engine bay side of the heat exchange structure . whenever the fans 82 are operated by energizing the motors 78 , they are effective to draw air through the core areas of the condenser 42 and radiator 40 so that the air passes through the inlet cones 62 and through scrolls 64 to be discharged at the scroll outlets 72 . the scroll outlets 72 convey the hot effluent out of the engine bay by the outlets either passing through the inner fender walls 14 and 16 directly or else by connecting to ducts ( not shown ) which exit the engine bay . when the vehicle is in forward motion , ram air is forced through the condenser , the radiator and the ducted fans to be discharged via the outlets 72 if the fans are not operating . at the same time ram air is forced through the vertically elongated openings 24 , 26 , and the horizontally elongated openings 36 and 38 to ventilate the engine bay . the air that passes through these openings 24 , 26 , 36 and 38 is not heated by the condenser or radiator , and therefore the engine bay is ventilated with ambient air , not with effluent from the condenser and radiator . it is contemplated that the structural cross - member 22 can be fabricated by any of several conventional techniques . for example it could be a stamped metal part or it could be a moulded structural plastic part . it is also possible that the inlet cones 62 could be integrally formed with the structural cross - member . the struts 74 and motor mount 76 can also be integrally formed with the inlet cone . scrolls 64 are fabricated to have an upper part 84 that can be disassembled from a lower part 86 . this can provide access to the fans and motors if service is necessary . the electric motor 78 and fans 82 are conventional and the scrolls 64 are constructed in accordance with conventional fabrication techniques . the ducted fans are preferably of a type that is commonly known as a mixed flow fan . while a preferred embodiment of the invention has been disclosed , it will be appreciated that principles are applicable to other embodiments .