| 摘要 |
<p>The vent has an aerator opening (20) forming the exit, in the plane of the base plate (10), of a channel (13) underlying it. The channel has a longitudinal axis (XX) following the roof pitch and it has w.r.t. the opening, an inclined part (35) extended by a base parallel to the interior base plate face (12). The U shaped channel is attached to the base plate. The four sided base plate has lower (15), top (16) and lateral (17,18) sides, all having side strips (19) folded at 180 deg. to form a reinforcing frame that also ensures a seal with neighbouring pieces.</p> |
