| 摘要 |
<p>A housing for connecting a ventilation inlet/outlet grille (15) with an air duct system (5 to 8) has the grille (15) connoted to the housing (2) by intermediate fittings which include a filter and adjustable spacers. This provides separate access to the grille and enables the installer to mount the grille flush with the wall rendering. The fittings are secured by clips and fasteners with adjustable grips.</p> |
