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A diverter duct for a ventilation system includes a main body defining an inner surface, a first portion including an inlet, a second portion located downstream of the first portion, a third portion including an outlet, an opening located between the first portion and the third portion, and an air d

A diverter duct for a ventilation system includes a main body defining an inner surface, a first portion including an inlet, a second portion located downstream of the first portion, a third portion including an outlet, an opening located between the first portion and the third portion, and an air deflector positioned within the main body downstream of the first portion to deflect a portion of the air from the inlet of the main body towards the opening. A first contoured section is formed in the first portion of the main body. The first contoured section may direct air received from the inlet towards the opening at a first operating condition. A method of installing the diverter duct includes coupling the inlet with an upstream fan, and coupling the outlet with an outlet fan, such that selective operation of the inlet and outlet fans cause vary airflow though the outlet or the opening.

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1. A diverter duct for a ventilation system, wherein the ventilation system is operable in a first operating condition, the diverter duct comprising: a main body defining an inner surface, a first portion including an inlet, a second portion located downstream of the first portion, a third portion i

1. A diverter duct for a ventilation system, wherein the ventilation system is operable in a first operating condition, the diverter duct comprising: a main body defining an inner surface, a first portion including an inlet, a second portion located downstream of the first portion, a third portion including an outlet, and an opening located between the first portion and the third portion;a first contoured section formed in the first portion, the inner surface at the first contoured section having a center of a cross sectional area of a first, constant radius measured from a selected point offset from an outermost surface of the diverter duct curving to the opening such that an upper surface and a lower surface of the first contoured section form a section of a toroid;the second portion having a contoured section with a second radius measured between the center of the first portion and a selected point offset from an outermost surface of the diverter duct aligned with an axis of symmetry of the diverter duct extending through and opposite the opening, forming a section of a toroid, and configured to direct air received from the inlet towards the opening at the first operating condition; andan air deflector fixedly attached to and projecting around a portion of a cross section of a perimeter of the inner surface of the main body at a location downstream of the first portion, and having an edge extending from the inner surface coinciding with a continuation line of the upper surface of the first contoured section, the air deflector positioned at an angle with respect to the axis of symmetry of the diverter duct to deflect a portion of the air received from the inlet of the main body towards the opening at the first operating condition such that the air received through the inlet is substantially unable to exit the diverter duct through the outlet at the first operating condition. 2. The diverter duct of claim 1, wherein the first contoured section is circular in cross section. 3. The diverter duct of claim 1, wherein the second portion of the main body is configured to direct the air received from the inlet towards the third portion at a second operating condition. 4. The diverter duct of claim 3, wherein the second operating condition represents the air received from the inlet exiting the diverter duct through the outlet. 5. The diverter duct of claim 4, wherein the third portion of the main body is configured to direct the air received from the inlet of the main body out of the outlet of the main body at the second operating condition. 6. The diverter duct of claim 1, wherein the third portion of the main body is substantially a mirror image of the first portion of the main body. 7. The diverter duct of claim 1, wherein the second portion and the third portion of the main body each include respective contoured sections, and wherein the second portion is contoured in a direction that generally opposes a contour of the first portion and a contour of the third portion. 8. The diverter duct of claim 1, wherein the opening is sized such that at the first operating condition the air received through the inlet substantially fills the opening. 9. A ventilation system operable in a first operating condition, the ventilation system comprising: an upstream fan powered on and a downstream fan powered off at the first operating condition; anda diverter duct having an inlet fluidly coupled to the upstream fan, an outlet fluidly coupled to the downstream fan, the diverter duct further including:a main body that defines an inner surface, a first portion including the inlet, a second portion located downstream of the first portion, a third portion including the outlet, and an opening located between the first portion and the third portion;a first contoured section formed in the first portion, the inner surface at the first contoured section having a center of a cross sectional area of a first, constant radius measured from a selected point offset from an outermost surface of the diverter duct curving to the opening, such that an upper surface and a lower surface of the first contoured section form a section of a toroid configured to direct air received from the inlet of the main body towards the opening at the first operating condition; andan air deflector fixedly attached to and projecting around a portion of a perimeter of a cross section of the inner surface of the main body downstream of the first portion, and having an edge extending from the inner surface coinciding with a continuation line of the upper surface of the first contoured section, the air deflector positioned at an angle with respect to the axis of symmetry of the diverter duct to deflect a portion of the air received from the inlet of the main body towards the opening at the first operating condition such that the air received through the inlet is substantially unable to exit the diverter duct through the outlet at the first operating condition. 10. The ventilation system of claim 9, wherein the first contoured section is circular in cross. 11. The ventilation system of claim 9, wherein the second portion of the main body is configured to direct the air received from the inlet of the main body towards the third portion at a second operating condition. 12. The ventilation system of claim 11, wherein the second operating condition represents the air received from the inlet exiting the diverter duct through the outlet and towards the downstream fan. 13. The ventilation system of claim 12, wherein the third portion of the main body is configured to direct the air received from the inlet out of the outlet at the second operating condition. 14. The ventilation system of claim 9, wherein the third portion of the main body is substantially a mirror image of the first portion of the main body. 15. The ventilation system of claim 9, wherein the second portion and the third portion of the main body each include respective contoured sections, and wherein the second portion is contoured in a direction that generally opposes a contour of the first portion and a contour of the third portion. 16. The ventilation system of claim 9, wherein the opening is sized such that at the first operating condition the air received through the inlet substantially fills the opening. 17. A method of guiding air through a diverter duct of a ventilation system in an aircraft, the diverter duct including a first contoured section having an inlet, a second contoured section, and a third contoured section having an outlet, the method comprising: generating an airflow by an upstream fan, wherein the inlet of the diverter duct is fluidly coupled with the upstream fan such that the airflow generated by the upstream tan enters the inlet;guiding the airflow generated by the upstream fan through an opening of the diverter duct by the first contoured section of the diverter duct at a first operating condition of the ventilation system, the first contoured section having a center of a cross sectional area of a first, constant radius measured from a selected point offset from an outermost surface of the diverter duct curving to the opening, such that an upper surface and a lower surface of the first contoured section form a section of a toroid;deflecting a portion of the air received from the inlet towards the opening at the first operating condition by an air deflector fixedly attached to and projecting around a portion of a perimeter of a cross section of an inner surface of the diverter duct downstream of the first contoured section, wherein the air deflector is positioned at an angle with respect to the axis of symmetry of the diverter duct, and having an edge extending from the inner surface coinciding with a continuation line of the upper surface of the first contoured section, to deflect the portion of the air received from the inlet of the main body such that the air received through the inlet of the diverter duct is substantially prohibited from exiting the diverter duct through the outlet at the first operating condition such that a downstream fan fluidly coupled to the outlet of the diverter duct does not substantially windmill. 18. The method of claim 17, further comprising guiding the airflow generated by the upstream fan through an opening of the diverter duct by the first contoured section of the diverter duct at a second operating condition defined by the air received from the inlet exiting the diverter duct through the outlet and towards the downstream fan. 19. The method of claim 18, further comprising guiding the airflow generated by the upstream fan through an opening of the diverter duct by the first contoured section of the diverter duct at a third operating condition defined by the downstream fan operating and the upstream fan not operating. 20. A method of installing a diverter duct to an aircraft, the diverter duct including a first contoured section having an inlet, a second contoured section, a third contoured section having an outlet, and an air deflector, the method comprising: fluidly coupling the inlet of the diverter duct with an upstream fan such that an airflow generated by the upstream fan enters the inlet of the diverter duct, wherein the airflow generated by the upstream fan is guided through an opening of the diverter duct by the first contoured section at a first operating condition, the first contoured section having a center of a cross sectional area of a first, constant radius measured from a selected point offset from an outermost surface of the diverter duct curving to the opening, such that an upper surface and a lower surface of the first contoured section form a section of a torrid; andfluidly coupling the outlet of the diverter duct with a downstream fan such that the airflow received through the inlet of the diverter duct is substantially prohibited from exiting the diverter duct through the outlet such that the downstream fan does not substantially windmill at the first operating condition, and wherein the air deflector of the diverter duct is fixedly attached to and projects around a portion of a perimeter of a cross section of inner surface of the diverter duct and downstream of the first contoured section to deflect the airflow towards the opening at the first operating condition.