Chamberlain 1345M Manuel D’Utilisation

14

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).

• 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.

Lag Screw
5/16"-9 x 1-5/8"

Lag Screws
5/16"-9x1-5/8"

Highest Point of 
Garage Door Travel

Header
Wall

Garage
Door

UP

CEILING MOUNT ONLY

Wall Mounting Holes

Optional 
Wall Mounting Holes

The nail hole is for
positioning only. 
You must use lag screws 
to mount the header bracke

UP

CE

ILI

NG

 M

OU

NT 

ON

LY

Door Spring

Header

Bracket

2x4
Structural
Support

Horizontal
Line

Vertical 
Centerline
of Garage Door

Vertical 
Centerline
of Garage Door

UP

CEILING MOUNT ONLY

Ceiling Mounting Holes

The nail hole is for 
positioning only.
You must use lag screws 
to mount the header bracket.

UP

Lag Screws
5/16"-9x1-5/8"

Garage Door

Header Wall

Header

Bracket

6" (15 cm)

Maximum

Door
Spring

Vertical 
Centerline
of Garage Door

Vertical 
Centerline
of Garage Door

• 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.