| 摘要 |
<p>The ventilator has a rotatable closure and adjuster cooperating with at least two seal strips fixed inside housing. The closure and adjuster have one end supported in a bearing, and turnable to allow movement in radial direction. It includes profiles (17, 18) separated by a gap (19) which is bridged by a cast strip of synthetic resin (20). Insect repellant gauze (24) is fixed to the bottom frame (25). Inside grooves (26) fit seal strip or brushes.</p> |
