Abstract: One or more embodiments includes a door assembly with a door jamb and a door header. A connection system is provided that directs the weight of the door header directly into the door jamb. Load on the fasteners is reduced by the connection system along with the potential for slippage for the door header after installation.

Abstract: One or more embodiments includes a door assembly with a door jamb and a door header. A connection system is provided that directs the weight of the door header directly into the door jamb. Load on the fasteners is reduced by the connection system along with the potential for slippage for the door header after installation.

Abstract: One or more embodiments includes a door assembly with a door jamb and a door header. A connection system is provided that directs the weight of the door header directly into the door jamb. Load on the fasteners is reduced by the connection system along with the potential for slippage for the door header after installation.

Abstract: A door system includes a multi-panel door and a dual-synchronization drive assembly for the door system. The dual-synchronization drive assembly has a structural configuration and functionality that combines a drive mechanism with a synchronization mechanism. The dual-synchronization drive assembly transmits a drive force in a manner that causes linear movement of door panels of the multi-panel door system between an open position and a closed position. The dual-synchronization drive assembly causes a synchronized movement of the door panels at different linear speeds/velocities to fully advance the door panels to the open position or the closed position simultaneously. The dual-synchronization drive assembly includes a dual gear unit that is configurable to allow for any motion/speed ratio necessary in order to obtain a specific performance objective of the door system.