Chamberlain CG40DM - Manual (Page 13)

13
INSTALLATION STEP 2
Install the Header Bracket
You can attach the header bracket either to the wall above
the garage door, or to the ceiling. Follow the instructions
which will work best for your particular requirements. Do
not install the header bracket over drywall. If installing
into masonry, use concrete anchors (not provided).
WALL HEADER BRACKET INSTALLATION
1. Center the bracket on the vertical centerline with the
bottom edge of the bracket on the horizontal line as
shown (with the arrow pointing toward the ceiling).
2. Mark the vertical set of bracket holes. Drill 3/16" pilot
holes and fasten the bracket securely to a structural
support with the hardware provided.
CEILING HEADER BRACKET INSTALLATION
1. Extend the vertical centerline onto the ceiling as
shown.
2. Center the bracket on the vertical mark, no more
than 6" (15 cm) from the wall. Make sure the arrow
is pointing away from the wall. The bracket can be
mounted fl ush against the ceiling when clearance
is minimal.
3. Mark the side holes. Drill 3/16" pilot holes and fasten
bracket securely to a structural support with the
hardware provided.
HARDWARE SHOWN ACTUAL SIZE
Lag Screw
5/16"-9x1-5/8"
Wall Mount
Optional
Mounting Holes
— Header Wall —
Horizontal Line
Highest Point of
Garage Door Travel
Vertical Centerline
of Garage Door
Vertical
Centerline of
Garage Door
Door
Spring
2x4
Structural
Support
Lag Screws
5/16"-9x1-5/8"
— Garage Door —
— Finished Ceiling —
Vertical Centerline
of Garage Door
Ceiling Mounting Holes
Header
Bracket
Door
Spring
6" (15 cm)
Maximum
Garage Door
Vertical
Centerline
of Garage Door
Lag Screws
5/16"-9x1-5/8"
— Header Wall —
Header
Bracket