| 摘要 |
PROBLEM TO BE SOLVED: To provide an outdoor hood that can prevent wind, rain, snow, etc., from entering and an outer wall from being damaged by frost and stained, and a ventilation unit using the same, since there is a defect that watertightness is low because of large pressure loss under the influence of outside air on the outdoor hood and a defect that the coating of the outer wall swells and peels owing to steam from the interior side.SOLUTION: An outdoor hood includes a member having a backflow preventive structure such that flowing-in gas flows only in one direction. Further, there is provided a ventilation unit constituted by combining a heat storage element, an interior-side hood, a dust-proof filter, a ventilation fan, and a sleeve with the outdoor hood. |
