Chamberlain B353 Guide De L'utilisateur page 6

Installation
Attach 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).
OPTION A - Wall Installation
1. Center the bracket (I) 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 lag
screws (II) provided.
OPTION B - Ceiling Installation
1. Extend the vertical centerline onto the ceiling as shown.
2. Center the bracket (I) 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 flush 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 lag screws (II) provided.
To continue, go to Installation step 2 in the Installation
Manual
HARDWARE
II
Lag Screw 5/16"-9x1-5/8"
WALL INSTALLATION
Wall Mounting Holes
Structural
Support
Horizontal
Optional Mounting
Highest Point
Holes
of Garage
Door Travel
CEILING INSTALLATION
Ceiling Mounting
Holes
6" (15 cm)
Maximum
Door Spring
6
Header Wall
2x4
I
Line
Garage Door
I
Finished Ceiling
Garage Door
Center of Door
7/16"
II
Door
Spring
Center of Door
II
7/16"
Header Wall