Extension sleeve for wall and ceiling mounting.Article: VH 25, Installation location: Wall / ceiling, Material: Sheet steel, galvanized, Weight: 1.3 kg, Weight with packaging: 1.31 kg, Suitable for nominal width: 250 mm, Width: 276 mm, Height: 276 mm, Depth: 200 mm, Width with packaging: 276 mm, Height with packaging: 276 mm, Depth with packaging: 200 mm, Suitable for box fans: no, Suitable for roof fans: no, Suitable for pipe fans: no, Suitable for heat recovery systems: no, Suitable for wall-mounted fans: no, Suitable for wall-mounted fans: yes, Suitable for residential fans: no, Suitable for centrifugal fans: no, Suitable for circulation fans: no