This type of garage door opener normally has rollers running vertically on the door posts and a large spring across the top of the door. As the name implies a canopy door forms a canopy roughly equivalent to one third of the door`s height when fully opened.
Retractable
Usually large springs can be seen on both sides of the door. When fully open the door usually retracts all the way inside the garage. When the door is open, the bottom edge of the door is usually flush with the door frame (but not always)
Swing
In all cases you will need to use a Side Hinge Converter Bracket which links the operator and the leaves.
Roller
This type of garage door is normally made up of a number of sections which slide up and over in to the garage. Any type of operator can be used but please be sure to check the clearance above the door throughout it's opening cycle before ordering.