| 摘要 |
<p>The flap (1) or butterfly has a heated area, where an electrically-heated material forming a heating element is arranged. This is a fleece, film, foil or a positive temperature coefficient (PTC) element. The element is air-permeable and/or air-impermeable. The heating element has a flap area (4) arranged on it. The heater can be swung on the flap area. It is rigidly fitted to the flap area, or forms it. It is alternatively arranged inside the flap body, within a hollow interior. An auxiliary flap controls airflow through the interior. Further variants are proposed.</p> |
