Steel and Wood Sectional Doors are often used in commercial applications. The most common of these doors roll overhead and travel at an incline, vertically, or at a 90-degree angle. These doors travel on a track with rollers and are assisted by a spring counter balance system and cables. All of the components are replaceable. The headspace needed is only 14" with a 12" low headroom design available. They can be insulated, weather-sealed, or both.