It allows the doors to run on a high and a lower track at the same time taking care of the low clearance problem.
Sectional garage door ceiling clearance.
In order to install torsion spring hardware we recommend a clearance of 12 in.
There is a garage door accessory called a low clearance bracket kit or low headroom kit.
Dimension charts for sectional track sectional doors track headroom and backroom clearance standard lift track headroom clearance dimensions door height centerline of shaft minimum headroom 2 track 15 radius thru 12 0 o h.
When a garage door opens it rolls back on horizontal tracks.
121 mm to 12 in.
We have an older home 45 years plus and we replaced the one piece garage door with a garage door that breaks down in to 4 sections we used this with our low ceiling due to not have enough clearance.
12 5 8 15 3 4.
Headroom clearance is the distance between the top of the door opening and the ceiling.
11 5 8 14 1 4 thru 16 0 o h.
Used for typical applications.
The top of the door requires some room to make that turn.
12 radius 12 required 15 radius 14 25 required.
Most common garage door track.
Most standard garage doors with extension springs require a minimum of 10 inches of headroom.