| 摘要 |
H:/jzc/Intrwovn/NRPortbl/DCCJZC/7379196_l.docx-23/03/2015 - 14 A rotary vent with a rotary head that includes a circular array of blades extending between a bottom section and a top section of the head, wherein the top section has a reduced 5 diameter relative to the bottom section, wherein the blades are arranged to overlap and each blade is canted inwardly from the bottom section to terminate beneath the reduced diameter top section. The invention also provides a rotary vent that includes: a rotary head with blades arranged between a top and bottom section of the rotary head; a fixed component to mount the rotary head to a roof of a building, the fixed component having a 10 throat that provides a flow path from inside the building to an interior of the rotary head; a diffuser to split airflow vented from the throat and direct the vented airflow out through the rotary head; and a moveable damper to selectively restrict airflow through the throat. |
