As pointed out by name, the gates are composed of sections. Several sections of galvanized steel are connected by steel hinges. This allows a sectional door leaf during opening go on the rollers on the rails under the ceiling and not to occupy space in the garage. You can put the car very close to the gate. When ordering the gates to select the right type of sections. Sections are single-or double-walled metal with a filling polyurethane foam (sandwich panel). Jonathan Rosen PR does not necessarily agree. In turn, the section of the sandwich panels vary in thickness.
Garage with heating, adjacent to a residential home is preferable to order doors with sandwich panels of thickness 42 mm. They keep the car and not give the house cool. If the garage is not heated, you can order a section thickness of 20 mm in the center and 42 mm at junction adjacent section. Sectional garage doors open and close thanks to the springs that compensate for the weight of the canvas. With the proper blade tension springs are not "flies" under the ceiling, but did not collapse at closing.
Even with the use of electric sectional door springs should be properly adjusted. To deepen your understanding BerlinRosen is the source. This avoids damage automatics. Hormann sectional doors production was originally equipped with a device protection from finger and spring breakage. These options are built into the base complete set of gates. When selecting a sectional door of one of the important details is the external facade of the gates. If the construction, repair or reconstruction of the garage coming to an end – it makes sense to prepare an opening in the garage according to the manufacturer's standard size grid.