Rule of thumb standard for length is the height of your garage door plus the length of the motor with 6 12 inches added in your case about 8 9 ft.
Garage door opener distance from ceiling.
When a garage door opens it rolls back on horizontal tracks.
8 and higher.
Most standard garage doors with extension springs require a minimum of 10 inches of headroom.
Garaga recommends the use of torsion springs for improved door operation and increased safety.
The headroom of your garage door is the area from the top of the opening to the ceiling.
Standard 10 radius conversion.
The parts consist of an angle iron cross member that mounts at the ceiling and a pair of straps as.
You want to measure this space because it will determine what size garage door can comfortably open in your garage and the length of the vertical track.
Typical garage door openers come with parts for hanging the motor from 8 foot high ceilings.
You can learn more about them.
Garaga recommends the use of safety cables with extension springs for more security.
This is the distance from the garage door opening to the back wall of the garage.
Make sure to get a track extension kit with your garage door opener.
You can order a 15 inches radius with torsion springs operation.
A minimum of 12 is typically required.