Soft steel doors
The bottom frame of this type of door is made of horizontal and vertical welded cans. This frame consists of at least two vertical ties and three horizontal ties, and a soft steel sheet is placed on this frame as the final cover.
Lid
The structure of these type of doors is similar to soft steel doors, but corrugated steel sheet is used in the final part of the work.
The blank metal doors
Hollow metal doors are made of vertical and horizontal frames welded together, which are reinforced with T-shaped sections.
Covered metal doors
This type of door is made of a combination of hollow metal and wooden door, which is connected by a steel sheet from the inside. In this way, the air between the sheet and the frame is trapped. This also makes the door insulated. In addition, it prevents the flames from penetrating the door. As a result, this door can also be called a fireproof door.