Centurion SD04 Installation Manual page 29

6.2.2.1. Mounting the header bracket
The header bracket carries ALL of the opening and closing thrust of the
SDO4 and as such must be securely fastened to a rigid, structural
member of the garage. It is entirely up to the installer to determine the
fixing method and the structural suitability of the fixing points.
When marking important
lines needed for mounting
the header bracket, ensure
that a spirit level is used,
as it is imperative that
these lines are as level and
straight as possible.
Determine the highest arcing point
of the garage door and mark this as
a horizontal line on the header above
the top edge of the garage door.
Close the garage door, and
determine the garage door center
line and mark a vertical line on the
header above the door.
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Highest arcing point marked on header
Highest arcing
point
page 29
Header
Highest arcing point
Spirit level
Garage door
FIGURE 46
Garage door centre line
Garage door
FIGURE 47