A door frame consists of how many side jambs and head jambs?

A door frame typically consists of two side jambs and one head jamb. The side jambs are the vertical components on either side of the door, providing structural support and a surface for the door to close against. The head jamb is the horizontal component that spans the top of the door frame, completing the encasement of the door. This arrangement is standard in construction and allows for proper alignment and functionality of the door, facilitating its opening and closing while ensuring that it fits securely within the frame. Understanding this structure is essential for accurate installation and maintenance of passenger elevator doors and entrances.