Chamberlain C400 Owner's Manual page 18

Installation
STEP 8 Install the Door Bracket (continued)
OPTION B - ONE-PIECE DOORS
1. Center the door bracket on the top of the door, in line with the header bracket as shown.
2. Mark either the left and right, or the top and bottom holes.
Metal Doors:
Drill 3/16" pilot holes and fasten the bracket with the self-threading screws provided.
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Wood Doors:
Drill 5/16" holes and use 5/16"-18x2" carriage bolts, lock washers and nuts (not provided) or 5/16"x1-1/2"
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lag screws (not provided) depending on your installation needs.
NOTE: The door bracket may be installed on the top edge of the door if required for your installation. (Refer to the
dotted line optional placement drawing.)
Header Wall
2x4 Support
Header Bracket
Door Bracket
Vertical
Centerline
of Garage
Door
Metal Door
Self-Threading Screw
Top of Door
Door
(Inside Garage)
Bracket
Top Edge of
Door
Optional
Placement
18
(Finished Ceiling)
Optional
For a door with no exposed
Placement
framing, or for the optional
of Door
installation, use lag screws
Bracket
5/16"x1-1/2" (not provided)
to fasten the door bracket.
Wood Door
Door
Bracket
Hardware
(not provided)
Top of Door
(Inside Garage)
Top Edge
of Door
Optional
Placement
Hardware
(not provided)