Chamberlain B980C Manuel D'installation page 11

Header Wall
Vertical Centerline of Garage Door
2x4
Structural
Supports
Level
(Optional)
Sectional door with curved track
Header Wall
2" (5 cm)
Track
Highest
Point of
Travel
Door
One-piece door without track:
jamb hardware
Header Wall
8" (20 cm)
Door
Highest
Point of
Travel
Jamb
Hardware
OPTIONAL CEILING MOUNT
FOR HEADER BRACKET
Unfinished
Ceiling
2x4
One-piece door with horizontal track
Header Wall
2" (5 cm)
Door Track
Highest
Point of
Travel
One-piece door without track:
pivot hardware
Header Wall
8" (20 cm)
Highest
Door
Point of
Travel
Pivot