Chamberlain WHISPER DRIVE HD900D - Manual (Page 13)

13
Lag Screws
5/16"x9x1-5/8"
– Finished Ceiling –
Door
Spring
Header Wall UP
Ceiling Mounting Holes
6" (15 cm) Maximum
Header
Bracket
Vertical
Centerline
of Garage Door Garage Door
Vertical Centerline
of Garage Door
INSTALLATION STEP 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).
WALL HEADER BRACKET INSTALLATION
• 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).
• Mark the vertical set of bracket holes. Drill 3/16" pilot holes and
fasten the bracket securely to a structural support with the
hardware provided.
Lag Screw
5/16"x9x1-5/8"
HARDWARE SHOWN ACTUAL SIZE
CEILING HEADER BRACKET INSTALLATION
• Extend the vertical centerline onto the ceiling as shown.
• Center the bracket 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.
• Mark the side holes. Drill 3/16" pilot holes and fasten bracket
securely to a structural support with the hardware provided.
UP
Wall Mount
Optional
Mounting Holes
Lag Screws
5/16"x9x1-5/8"
Highest Point of
Garage Door Travel
Vertical
Centerline
of Garage Door
Header Wall
Garage Door
Door Spring
2x4
Structural
Support
Vertical
Centerline
of Garage Door
Header
Bracket
Horizontal
Line