Chamberlain 8355W Manual page 14

Installation
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).
Lag Screw 5/16"-9x1-5/8"
OPTION A - WALL 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 (do not use the holes designated for ceiling mount).
Drill 3/16" pilot holes and fasten the bracket securely to a structural support with lag screws.
Wall Mount
2x4 Structural
Support
Horizontal
Line
Optional
Highest Point of
Mounting
Garage Door
Holes
Travel
HARDWARE
(Header Wall)
Vertical
Centerline of
Garage Door
Header
Bracket
Lag Screw
5/16"-9 x 1-5/8"
Door Spring
(Garage Door)
OPTION B - CEILING 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 toward 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 hardware provided.
Ceiling Mounting Holes
Door Spring
14
Header
(Finished Ceiling)
Bracket
6" (15 cm)
Maximum
Lag Screw
5/16"-9 x 1-5/8"
(Garage Door)
Vertical
Centerline of
Garage Door
(Header Wall)