Up and Over Garage Doors
Canopy Garage Door
The canopy garage door is the most common and simplest type of garage door mechanism. The name derived from the fully opened garage door panel protruding about a third forward of the sub frame to form a canopy. 
It gives the maximum drive-through width when open and is the easiest to install.
The door is balanced and assisted by torsion springs positioned above the door panel on the head of the fixing frame.
The canopy door mechanism is generally only available up to 8 feet (2438mm) wide. This is not normally used if the garage door is to be automated.

Retractable Garage Door
The retractable garage door is fast becoming the more popular type of garage door mechanism, its name derived from the garage door panel retracting fully into the garage when open. It is the mechanism that will convert easily and safely into electric operation with the least equipment.
The drive-through width on a retractable mechanism is reduced as the lifting arms sit in between the sub-frame when the door is opened. Be careful when limited for opening width that you do not restrict access too much.
The retractable mechanism can take much heavier loads with adjustable tension springs at the sides easily increased in size and strength.
Retractable gears are generally used for garage doors over 8 feet wide and heavier door panels such as hardwood. All double garage doors have a retractable gear only.

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