17
8.4
Align the backing plates so that the centres of the fixing holes are at the
height of the duct centre line drawn on the wall (see section 6.11). Mark the
wall through two of the slotted holes in each backing plate. Usually the best
fixing positions will be those which are closest to the ends of the backing
plates.,
8.5
Remove the backing plates. Drill the wall at the marked positions using
a no. 10 drill. Fit the wall plugs supplied.
8.6
Fit two plastic duct support brackets to each backing plate through
the round holes with the machine screws and nuts supplied. The screw
heads must be on the outside (back) face of the backing plates (see figure
22).
The brackets should be fitted so that they will support the ducts as near as
practical to the ends of the ducts. Note, however
•
The brackets will not go over the swaged ends of the ducts.
•
The brackets will not go over the bridging tube.
•
The bottom angled edges of the backing plates should not catch in the
cable clip slots in the brackets.
8.7
Fix the backing plates to the wall. The plastic spacing washers must be
fitted between the backing plates and the wall. Fit using the wood screws
provided (see figure.23).
8.8
Place the flue ducts in position. Fit the bridging tube over one of
the ducts. Locate the ducts to the “Z” coupling, flue box and, if
applicable, elbows. The flue ducts snap into the plastic support brackets
(see figure 24).
If the alignment of the backing plates and ducts is not quite right, remove
the ducts, slacken the screws holding the backing plates to the wall and
realign them. Refit the ducts.
8.9
Slide the bridging tube so that it overlaps each duct by a minimum
of 50mm. Seal each end of the bridging tube to the ducts with the tape
supplied (see figure 21) .
8.10
Fit the fan cable into the “C” sections at the bottom of the support
brackets (see figure 25).
8.11
Further support for the fan cable (especially at corners) can be
provided using the spring cable clips supplied in the pack. Fit the clips to
the bottom edge of the backing plates and attach the cable (see figure 26).
Figure 26
Figure 25
Figure 24
Figure 23
Figure 22
