Chamberlain 1145-1/3HP - Manual (Page 17)

INSTALLATION STEP 8
Fasten Door Bracket and Plate
Follow instructions which apply to your door type
as illustrated below.
TO PREVENT DAMAGE TO LIGHTWEIGHT
AND METAL GARAGE DOORS (OR THOSE
WITH GLASS PANELS),
ALWAYS REINFORCE THE INSIDE OF DOOR—
BOTH VERTICALLY AND HORIZONTALLY—WITH
2X4
BOARDS OR ANGLE IRON.
The horizontal brace should be at least six feet long. The vertical brace should cover height of top panel. The best solution
is to check with the garage door manufacturer for a door reinforcement kit to be used with an opener installation.
: :
Sectional Door Installation Procedure
Position door bracket and plate assembly against door
within the following limits according to your
requirements (and centered on vertical guideline— or
to one toot left or right of center, if necessary):
A) Top edge of bracket 2" - 4" below top edge of door.
B) Directly below any structural support across top of
door.
Mark and drill 5/16" TOP and BOTTOM fastening holes.
Secure bracket assembly as shown.
17
All One-Piece Door Installation Procedure
NOTE: The door bracket has left and right side
fastening holes. Assemble and Install the door
bracket and plate if your installation requires top and
bottom fastening holes.
Center bracket (with or without plate as required) at the
top of the inside face of door as shown. Mark holes.
Drill 5/16" holes and fasten the door bracket with
hardware supplied.