| 摘要 |
A window or door frame 5 has a horizontal transom 4 above a glazing panel 3. An fan 2 or ventilation grille is mounted in an opening 6 in the frame above the transom 4. The opening 6 has a rebate 7 extending around its inner periphery. The fan 2 is held against one side of the rebate 7 and is clamped in position by a plate 21 held against the other side of the rebate by screws 22 extending between the fan and the plate. <IMAGE> |
