| 摘要 |
The air duct (1), which is connected to a fan through a ventilator (2), is made of a flexible material so that the air duct passes from a flat state when unused to an inflated state when supplied with air by the fan. Rigidifying elements prevent the twisting of the duct and its folding into bends. The duct may also comprises a sealing valve pivoting from an open position where the circulating air flow is a maximum to a closed position for clamping the duct so as to prevent the passage of air.
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