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An air check valve system configured to be mounted for fluid communication with a fan can include a ring having a generally circular inner diameter that defines an air passage through a plane of the ring. A first and a second flange can extend from the ring. A rod can have a first end mounted to the

An air check valve system configured to be mounted for fluid communication with a fan can include a ring having a generally circular inner diameter that defines an air passage through a plane of the ring. A first and a second flange can extend from the ring. A rod can have a first end mounted to the first flange and a second end mounted to the second flange. The rod can define a pivot axis. A first and a second damper plate can be mounted to the rod for rotation around the pivot axis between an open and a closed position.

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1. An air check valve system configured to be mounted for fluid communication with a fan, the air check valve system comprising: a ring having a generally circular inner diameter that defines an air passage through a plane of the ring;a first and a second flange that extend from the ring;a rod havin

1. An air check valve system configured to be mounted for fluid communication with a fan, the air check valve system comprising: a ring having a generally circular inner diameter that defines an air passage through a plane of the ring;a first and a second flange that extend from the ring;a rod having a first end mounted to the first flange and a second end mounted to the second flange, the rod defining a common pivot axis;a first and a second damper plate that are mounted to the rod for rotation around the common pivot axis between an open and a closed position, wherein the first and second damper plates share the common pivot axis of rotation; andfirst and second stops engaging the first and second dampers, respectively, when the first and second dampers are located in the closed position;wherein the pivot axis of the rod defines a non-parallel angle with the plane of the ring such that the first and second damper plates are influenced by gravity to locate at the closed position when the fan is in a deactivated state and airflow generated by the fan in an activated state urges the damper plates into the open position; andwherein a first volume of air is urged through the air passage in the open position and a second volume of air is permitted to flow through the air passage when the first and second dampers are in the closed position, and the second volume of air is non-zero and less than the first volume of air. 2. The air check valve system of claim 1 wherein the first flange defines a first flange mounting aperture located at a first distance from the ring and the second flange defines a second mounting aperture located at a second distance from the ring, the second distance being greater than the first distance. 3. The air check valve of claim 2, further comprising a third and a fourth flange that extend from the ring, and the first and second stops extending from the third and fourth flanges respectively. 4. The air check valve of claim 3 wherein the third and fourth flanges are diametrically opposed and the first and second flanges are diametrically opposed. 5. The air check valve of claim 4 wherein the ring is adapted to be mounted relative to the fan such that the second flange is lower than the first, third and fourth flanges. 6. The air check valve of claim 1 wherein the first and second flanges both have a generally semicircular shape. 7. A method of mounting an air check valve relative to a transition duct and a fan, the method comprising: disconnecting a fan collar extending from the fan from a transition duct collar extending from the transition duct;positioning an outer ring of the air check valve between the fan collar and the transition duct collar, the air check valve having a first and a second damper plate that are rotatably mounted around a rod at a non-parallel angle relative to a plane of the outer ring, wherein the first and second damper plates share a common axis of rotation around a common pivot axis defined by the rod; andcoupling the outer ring between the fan collar and the transition duct collar such that the first and second damper plates are influenced by gravity to locate at a closed position when the fan is in a deactivated state and wherein airflow generated by the fan in an activated state urges the damper plates into an open position; andorienting the rod in a generally upright position relative to ground with an upper portion of the rod located closer to the outer ring than a lower portion of the rod;wherein each of the fan collar, the transition duct collar, and the outer ring comprises a flat annular flange, and wherein coupling the outer ring between the fan collar and the transition collar further comprises positioning each of the fan collar and the transition collar in a position substantially corresponding to a pre-disconnecting position of the respective fan collar and transition collar. 8. The method of claim 7 wherein disconnecting the fan collar from the transition duct collar comprises: removing fasteners that extend through respective apertures formed through the fan collar and the transition duct collar. 9. The method of claim 8 wherein positioning the outer ring of the air check valve comprises: aligning ring apertures formed through the ring with the apertures formed through the fan collar and the transition duct collar. 10. The method of claim 9 wherein coupling the outer ring comprises: locating fasteners through axially aligned apertures of the fan collar, ring and transition duct collar; andthreadably advancing the respective fasteners into a secure position. 11. An air check valve system configured to be mounted for fluid communication with a fan, the air check valve system comprising: a ring having a generally circular inner diameter that defines an air passage through a plane of the ring;a first and a second flange that extend in a diametrically opposed relationship from the ring, wherein the first flange defines a first flange mounting aperture located at a first distance from the ring and the second flange defines a second mounting aperture located at a second distance from the ring, the second distance being greater than the first distance;a rod defining a common pivot axis and having a first end positioned through the first flange mounting aperture and a second end positioned through the second flange mounting aperture;a first and a second semi-circular damper plate that are each mounted around the rod for rotation between an open and a closed position around the common pivot axis of the rod; andfirst and second stops engaging the first and second dampers, respectively, when the first and second dampers are located in the closed position;wherein the second flange mounting aperture is located further away from the plane of the ring compared to the first flange mounting aperture such that the first and second damper plates are influenced by gravity to locate at the closed position when the fan is in a deactivated state and airflow generated by the fan in an activated state urges the damper plates into the open position; andwherein a first volume of air is urged through the air passage in the open position and a second volume of air is permitted to flow through the air passage when the first and second dampers are in the closed position, and the second volume of air is non-zero and less than the first volume of air. 12. The air check valve of claim 11, further comprising a third and a fourth flange that extend from the ring, and the first and second stops extending from the third and fourth flanges, respectively. 13. The air check valve of claim 12 wherein the third and fourth flanges are diametrically opposed. 14. The air check valve of claim 13 wherein the ring is adapted to be mounted relative to the fan such that the second flange is lower than the first, third and fourth flanges. 15. The air check valve of claim 11 wherein the rod defines a pivot axis that is non-parallel relative to the plane of the ring.