Ortech Y-H2 Operation & Installation Instructions page 24

CEILING MOUNTING INSTALLATION
 8 x expansion bolts for cement ceiling

IMPORTANT: The angle bars must have an overlap of AT LEAST 100 mm.
1) Position the hanging plate on the
ceiling and then mark the position of the screw holes.
The hanging plate should be securely fixed to the ceiling,
 11 x ST6 (40 mm) screws for wooden ceiling
2) Fix the angle bars to the hanging plate,
using the 8 x M5 screws.
3) Extend the angle bars to the required height and then fix them in
position using the 16 x M5 screws and nuts with metal washers.
4) If your cooker hood is going to be used in extraction mode, then you
should connect the ducting hose to the ceiling adaptor at this point.
Fix the upper chimney section to the hanging plate, using the 4 x
self-tapping screws.
Slide the lower chimney section onto the angle bars and raise it until
it sits just below the upper chimney section.
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