The answer depends on the door's size and how it's built. For a rolling door, the full weight and loads are actually supported by the guides at the jambs—the header doesn't carry any of the door's weight. The only exception is if the door is so wide that it needs a multi-piece hood. In that situation, supports are installed at the header, but their only purpose is to hold up the spliced sheet metal hood, not the door itself. The guides of a rolling door support the weight of the coil box right at the jambs. Want to see how your door will be mounted? Our Architectural Design Support expert Ross Baran explains it all right
here.