Install The Header Bracket - Chamberlain LiftMaster 3275C Owner's Manual

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
• 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).
• Mark the vertical set of bracket holes (do not use the holes
designated for ceiling mount). Drill 3/16" pilot holes and fasten
the bracket securely to a structural support with the hardware
provided.
HARDWARE SHOWN ACTUAL SIZE
Lag Screw
5/16"-9x1-5/8"
CEILING HEADER BRACKET INSTALLATION
• Extend the vertical centerline onto the ceiling as shown.
• Center the bracket on the vertical mark, no more than
6" (15 cm) from the wall. Make sure the arrow is pointing
toward the wall. The bracket can be mounted flush against the
ceiling when clearance is minimal.
• Mark the side holes. Drill 3/16" pilot holes and fasten bracket
securely to a structural support with the hardware provided.
The nail hole is for
positioning only.
You must use lag screws
to mount the header bracket.
Ceiling Mounting Holes
CEILING MOUNT ONLY
UP
9
Wall Mounting Holes
CEILING MOUNT ONLY
UP
Optional
Wall Mounting Holes
Header
Wall
2x4
Header
Structural
Bracket
Support
Horizontal
Line
Highest Point of
Garage Door Travel
– Finished Ceiling –
Header
Bracket
6" (15 cm)
Maximum
Door
Spring
Garage Door
Vertical
Centerline
of Garage Door
The nail hole is for
positioning only.
You must use lag screws
to mount the header bracket.
Vertical
Centerline of
Garage Door
Lag Screws
5/16"-9x1-5/8"
Door Spring
Garage
Door
Vertical
Centerline of
Garage Door
Vertical
Centerline
of Garage Door
Lag Screws
5/16"-9x1-5/8"
Header Wall