| 摘要 |
A ventilating frame (230) and arrangement, particularly for use in securing a window (205) or door panel such as a pre-assembled window or door in a building with flat solid walls or cavity walls (60, 70), such window or door needs no opening lights or needs to open at all as the frame can allow all the ventilation required by all the European Building Standards, and the degree of ventilation can be infinitely variable. |
