When installing a roller garage door, the mechanism they use to move by can vary between models. Often they are either either spring assisted for manual operation, or electric operated with either a tube motor set or an external fitted motor driving the roller barrel via a gear cog or a chain mechanism.

Sectional garage doors are designed to be manually operated, so when it comes to installing an automated system there may be some adjustments that need to be made to the spring mechanisms. This involves chosing where the springs are positioned around the door, which will effect its arc of movement.

Height requirements for standard sectional door gears usually vary between 100mm to 230mm. The side room required either side is between 75 and 90mm on most sectional garage doors, 125mm for the very large doors up to 8 metres wide. Garage door suppliers can often offer special adjustments upon request.