Chamberlain 9950 User Manual

5

Access
Door

Safety
Reversing Sensor

Safety
Reversing
Sensor

Header

Bracket

Door
Bracket

Straight
Door
Arm

Curved
Door Arm

Trolley

Emergency Release
Rope & Handle

Rail 

Garage
Door

Header
Wall

Rail
Bracket

Gap between floor 
and bottom of door
must not exceed 1/4" 

• Generally, a one-piece door does not require

reinforcement. If your door is lightweight, refer to
the information relating to sectional doors in
Installation Step 12.

• Depending on your door’s construction, you may

need additional mounting hardware for the door
bracket (Step 12).

Safety Reversing
Sensor

FINISHED CEILING

Support bracket
& fastening
hardware is required.
See page 20.

Safety Reversing 
Sensor

Header Wall

Access
Door

Gap between floor
and bottom of door 
must not exceed 1/4"

Motor unit

Wall-mounted
Door Control

Rail

Header

Bracket

Trolley

Straight
Door
Arm

Emergency 
Release
Rope & Handle

Door 
Bracket

Curved
Door
Arm

Header
Wall

Rail 

Garage
Door

Rail
Bracket

Without a properly working safety reversal system,
persons (particularly small children) could be
SERIOUSLY INJURED or KILLED by a closing garage
door.
• The gap between the bottom of the garage door and

the floor MUST NOT exceed 1/4". Otherwise, the safety
reversal system may not work properly. 

• The floor or the garage door MUST be repaired to

eliminate the gap.