Kathrein HDM 143, Руководство пользователя

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Reinforce the roof
Reinforce the roof in the hole area by means of a wooden spacer ring if the roof duct is only screwed together with the
knurled nut from below, see Step 10,
„Install the jointed mast“ ):
spacer ring
installation wall
roof
roof
tension spring
swivel ring
Install the jointed mast
1. Check the wall thick-
ness.
2. If the wall is too thin,
reinforce it.
3. Put the template on the
ceiling and drill a centre
hole. For the template,
go to page 9.
4. Use the circular drill bit
to drill a hole of
∅
38
mm from below.
Roof reinforcement
by means of a wooden spacer ring