It is possible to fix the hood in position, if necessary, by only attaching it to the rear wall. Proceed as follows: 1. Drill the four holes on the wall as indicated (Fig. 11). 2. Insert the four rawl plugs supplied into these holes. 3. Screw the two mountings hooks into the top two rawl plugs (Fig. 12). 4. Dismount the spacer M (Fig. 12) from the body of the hood by unscrewing completely the two spacer fixing screws O and washers. 5. Fix the base spacer M to the wall (Fig. 12) with the two screws R 5x45 provided (Fig. 11) using either the long or the short arm, depending on the depht of the side cupboards. Do not tighten the screws fully. 6. Fix the hood to the wall by means of the two hooks P previously mounted, but first move the upper brackets S (Fig. 11) so that the front panel of the hood, once mounted, will be in line with the front edge of the cupboard doors. The two upper brackets S, located at the top rear edge of the hood may be slid backwards and forwards by loosening its fixing screws T adjacent to them on the upper hood surface (Fig. 11). 7. Check that the hood is at the right height. Minor height adjustments may be made with the screws U embodied in the brackets (see Fig. 11). 8. Tighten the two wall fixing screws R, through the two access holes N provided on the inside of the hood (Fig. 12) then fix the lower sliding frame to the hood with two screws O and washers previously unscrewed (item 4).