In a door installation, the main purpose of the header is to?

The main purpose of the header in a door installation is to support the weight of the doors. The header is a structural element that spans the top of the door frame, ensuring that the doors are securely mounted and can operate correctly without sagging or misalignment. It distributes the weight of the door and any loads above it, making it an essential component for maintaining the integrity and functionality of the door system.

While other choices might address different aspects of door installation, such as aesthetics or guiding the door during operation, the primary role of the header is to provide structural support. This function is critical for ensuring that the doors can open and close smoothly and effectively, contributing to the overall performance and longevity of the installation.