If your door has extension springs the opener must be installed in the center of the door.
Mounting a garage door opener off center.
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To offset mount the opener arm to the door section.
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.
You may need to duplicate this for an off center mount.
Can an opener be offset from the center maybe a couple of feet.
Attach the straps to the irons with hex head screws.
Attach the straps to the power unit with the hardware provided.
Bolt the angle irons to a rafter or rafters with lag screws.
This type of garage door drive has a ceiling mounted system with a rail track and lift you maneuver using a chain belt or screw drive mechanism.
As you said run perforated angle iron from the center stile to the next stile over.
Most units hang from angle irons and metal straps that have holes drilled in them at regular intervals.
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.
Overhead garage door openers have traditionally been the most common popular option for homeowners.
You can t solve you re problems with the same level of thinking that created the problems.
Use one piece as near to the top as you.
Go ahead and mount it off center and save yourself a headache.
That means the garage door opener won t work if it is placed in the center of the door.
Offset garage door opener guests.