The utility model relates to an exhaust duct that prevents head wind, especially to a movable air discharging door type one-way air exhaust device.

本实用新型涉及一种防逆风排风管，特别是涉及一种活动排风门式的单向 排风装置。

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The utility model relates to an exhaust duct that prevents head wind, especially to a movable air discharging door type one-way air exhaust device.

本实用新型涉及一种防逆风排风管，特别是涉及一种活动排风门式的单向 排风装置。

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