Superstructure for chimneys or other smoke extractors with at least one wind guide plate incorporates at least one further flap which jointly with the wind guide plate rotates about a horizontal axis
摘要
<p>The superstructure for chimneys (4) or other smoke extractors with at least one wind guide plate (1) incorporates at least one further flap (2) which jointly with the wind guide plate rotates about a horizontal axis (3).</p>
