| 摘要 |
<p>The rotary grille (3) comprises a cylindrical shell (12), (13) with slots (14), (15) mounted in a frame (5), (6) between sealing brushes (11). An anti-insect mesh (16) is fitted across the airway. The frame (5), (6) is mounted in the end of an elongated housing (23), (43). This housing is fitted into the door or wall (1) with appropriate thermal barriers. The sections of the housing have inlet baffles (25), (50) forming a weathered inlet leading to the horizontal airway (52). The airway is lined with sound attenuating material (28), (51).</p> |
