support ring each of the annular vents provides separate passages for cooling the adjacent cheek of the brake rotor and separate inlets are provided for the dual vents from opposite sides of the central support ring aligned and staggered vane embodiments and parallel and angled passage embodiments are disclosed the dual vents increase both the flow rate and the surface area for heat transmission and flow the air closer to the heated cheek surfaces the staggered vanes improve stiffness and the slanted passages have potential stiffness and heat sink advantages application_number US 7922402 A description referring first to fig1 and 2 of the drawings in detail numeral 10 generally indicates a first embodiment of a double vented brake rotor according to the invention rotor 10 includes a hub 12 having a generally cylindrical body 14 ending axially outwardly from a radially inwardly extending ring 16 having openings not shown for attachment of the hub to a wheel spindle of a vehicle adjacent its inner end the hub 12 is connected with a radially outwardly extending central support ring 18 an annular brake disk 17 is carried by the hub 12 at its inner end the brake disk 17 includes a central support ring 18 which is fixed to the hub 12 and extends radially outward therefrom the disk 17 further includes inboard and outboard cheeks 22 and 23 respectively spaced to either side of the support ring 18 to form double inboard and outboard vents 20 21 the inboard and outboard cheeks 22 23 have outer surfaces 24 adapted to be engaged by the brake pads of a disk brake mechanism not shown.