F
E
- 20 mm
5. Measure the distance as indicated in the figure and subtract 20 mm.
6. Saw the flat duct to size.
7. Install the coupling, the vertical elbow and the flat duct.
H
G
+ 30 mm
8. Measure the distance between the vertical elbow and the cut-out and add 30 mm.
9. Saw the coupling to size. If necessary, use the sawn-off part of the flat channel for this.
10. Make the duct airtight with sealing tape.
11. Place the box.
75
Installation