Determine The Header Bracket Location - Chamberlain 1345M Owner's Manual

INSTALLATION STEP 1
Determine the Header Bracket
Location
To prevent possible SERIOUS INJURY or DEATH:
• Header bracket MUST be RIGIDLY fastened to structural
support on header wall or ceiling, otherwise garage door
might not reverse when required. DO NOT install header
bracket over drywall.
• Concrete anchors MUST be used if mounting header
bracket or 2x4 into masonry.
• NEVER try to loosen, move or adjust garage door, springs,
cables, pulleys, brackets, or their hardware, all of which are
under EXTREME tension.
• ALWAYS call a trained door systems technician if garage
door binds, sticks, or is out of balance. An unbalanced
garage door might not reverse when required.
Installation procedures vary according to garage door
types. Follow the instructions which apply to your door.
SECTIONAL DOOR
AND ONE-PIECE DOOR WITH TRACK
1. Close the door and mark the inside vertical centerline
of the garage door.
2. Extend the line onto the header wall above the door.
You can fasten the header bracket within 4 feet (1.2
m) of the left or right of the door center only if a
torsion spring or center bearing plate is in the
way; or you can attach it to the ceiling (see
page 10) when clearance is minimal. (It may be
mounted on the wall upside down if necessary, to
gain approximately 1/2" (1 cm).)
If you need to install the header bracket on a 2x4
(on wall or ceiling), use lag screws (not provided)
to securely fasten the 2x4 to structural supports as
shown here and on page 13.
3. Open your door to the highest point of travel as
shown. Draw an intersecting horizontal line on the
header wall 2" (5 cm) above the high point. This height
will provide travel clearance for the top edge of the
door.
Proceed to Step 2, page 14.
Header
Wall
Ceiling
Header Wall
2" (5 cm)
Highest Point
of Travel
Door
One-piece
door with
horizontal
track
12
Finished
Ceiling
Structural
2x4
Supports
Vertical
Centerline
of Garage Door
Track
Sectional door
with curved
track
Header Wall
2" (5 cm)
Highest Point
of Travel
Door
Track