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A passive ventilation control system and method. The system includes passive vents throughout a building. The vents may be arranged in multiple sets, with each set being substantially vertically aligned through multiple floors or the entire height of the building. Sensors are positioned inside and/o

A passive ventilation control system and method. The system includes passive vents throughout a building. The vents may be arranged in multiple sets, with each set being substantially vertically aligned through multiple floors or the entire height of the building. Sensors are positioned inside and/or outside the building for sensing different environmental parameters or atmospheric conditions. The sensors send signals to a controller, which automatically adjusts airflow through the vents in response to the signals from the sensors.

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1. A roof field vent comprising: a vent member having at least a portion configured to be installed on a roof deck of a roof, the vent member separate from the roof deck and including a first opening and a second opening, said portion of the vent member configured to be secured at an aperture extend

1. A roof field vent comprising: a vent member having at least a portion configured to be installed on a roof deck of a roof, the vent member separate from the roof deck and including a first opening and a second opening, said portion of the vent member configured to be secured at an aperture extending through a thickness of the roof deck so that air can flow along a first flow path through the aperture and the first opening or along a second flow path through the aperture and the second opening, each of the first and second flow paths extending between an exterior region above the roof and an interior region below the roof, the interior region at least partially bounded by the roof deck;a vent door operatively connected to the vent member, the vent door having an open position in which the vent door permits airflow along the first flow path and through the first opening and a closed position in which the vent door substantially prevents airflow along the first flow path and through the first opening; andan actuator configured to move the vent door between the open and closed positions based on ambient temperature;wherein the vent member, when said portion is secured at the aperture in the roof deck, is configured to conduct airflow along the second flow path through the aperture and the second opening between the exterior region above the roof and the interior region below the roof regardless of the position of the vent door and ambient temperature. 2. The roof field vent of claim 1, wherein the actuator comprises a bimetallic strip. 3. The roof field vent of claim 1, wherein the actuator comprises a bimetal motor. 4. The roof field vent of claim 1, wherein the second opening comprises a plurality of louvers configured to facilitate at least a portion of the airflow along the second flow path conducted by the vent member between the exterior region above the roof and the interior region below the roof regardless of the position of the vent door. 5. The roof field vent of claim 1, wherein the vent member comprises a vent base member and a vent cover configured to reside over the vent base member; and wherein the first opening comprises a vent base opening in the vent base member and configured to be in fluid communication with the aperture in the roof deck when the vent base member is secured to the roof deck; anda vent cover opening in the vent cover and in fluid communication with the vent base member opening; andwherein the vent door is operatively connected to the vent cover. 6. The roof field vent of claim 5 wherein the second opening comprises a plurality of louvers on the vent cover configured to facilitate at least a portion of the airflow along the second flow path conducted by the vent member between the exterior region above the roof and the interior region below the roof regardless of the position of the vent door and ambient temperature. 7. The roof field vent of claim 5 wherein the second opening comprises a gap between eave-facing edges of the vent cover and the vent base member, the gap configured to facilitate at least a portion of the airflow along the second flow path conducted by the vent member between the regions above and below the roof regardless of the position of the vent door and ambient temperature. 8. The roof field vent of claim 5 wherein the vent base member and the vent cover are configured to be oriented generally along a planar portion of the roof deck. 9. The roof field vent of claim 1, wherein the vent door is configured to cover substantially an entire top surface of the vent member in the closed position. 10. The roof field vent of claim 1, wherein the actuator comprises a shape memory alloy. 11. The roof field vent of claim 1 wherein the vent member is configured to be oriented generally along a planar portion of the roof deck. 12. The roof field vent of claim 1, wherein a lower surface of the vent member is installed on an upper surface of the roof deck. 13. A roof field vent comprising: a vent member having at least a portion configured to be installed on a roof deck of a roof, the vent member including a first opening and a second opening, said portion of the vent member configured to be secured over an aperture in the roof deck so that air can flow along a first flow path through the aperture and the first opening or along a second flow path, through the aperture and the second opening, wherein each of the first and second flow paths extend between an exterior region above the roof and an interior region below the roof, the interior region at least partially bounded by the roof deck;a single vent door operatively connected to the vent member, the vent door having an open position in which the vent door permits airflow along the first flow path and through the first opening and a closed position in which the vent door substantially prevents airflow along the first flow path and through the first opening; andan actuator configured to move the vent door between the open and closed positions based on ambient temperature;wherein the vent member, when said portion is secured over the aperture in the roof deck, is configured to conduct airflow along the second flow path through the aperture and the second opening between the exterior region above the roof and the interior region below the roof regardless of the position of the single vent door and ambient temperature. 14. A roof field vent comprising: a vent member having at least a portion configured to be installed on a roof deck of a roof, the vent member including a first opening, said portion of the vent member configured to be secured at an aperture in the roof deck so that air can flow along a first flow path extending through both the aperture and the first opening, between an exterior region above the roof and an interior region below the roof, the interior region at least partially bounded by the roof deck;a vent door operatively connected to the vent member, the vent door having an open position in which the vent door permits airflow along the first flow path, and a closed position in which the vent door substantially prevents airflow along the first flow path; andan actuator configured to move the vent door between the open and closed positions based on ambient temperature;wherein the vent member, when said portion is secured at the aperture in the roof deck, is configured to conduct airflow along a second flow path extending from the interior region below the roof, through the aperture, along a bottom surface of the vent member, and through a second opening in the vent member to the exterior region above the roof, regardless of the position of the vent door and ambient temperature.