You can be off center with the opener provided the door has a torsion spring which it sounds like yours does if your door was extension spring the kind when the spring stretch along the horizontal track then it wouldn t work properly.
Mounting garage door opener off center.
The greatest guide to how to fix a garage door that s off track giel garage doors if your garage ceiling is completed you can mount a 3 4 inch plywood pan.
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To offset mount the opener arm to the door section.
If the door is properly balanced you should be able to locate the operator anywhere but always perpendicular to the door.
The opener can be installed within 4 feet to the left or right of the door center if there is a torsion spring or center bearing plate in the way of the header bracket or door bracket area.
That means the garage door opener won t work if it is placed in the center of the door.
As you said run perforated angle iron from the center stile to the next stile over.
Set it securely on top of a stepladder so it s conveniently close to the ceiling.
The exact location depends on the type of door.
Lift the power unit.
Offset garage door opener guests.
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If your door has extension springs the opener must be installed in the center of the door.
Go ahead and mount it off center and save yourself a headache.
Some of the door openers especially commercial brands mount along side of the door on the wall and may work if you can find one that is cost effective.
Most doors are reinforced for the operator to mount in the center.
You may need to duplicate this for an off center mount.