Side-hung multi-purpose steel doors are characterised by the simple, lightweight, and durable construction of door leafs as well as a well-thought-out system of door frame profiles. Thanks to these specific characteristics, they are commonly used in all areas; in residential housing, industrial, and public facilities. They ensure a functional and solid closing of both: building openings of a typical size and non-standard internal reveals requiring made-to-measure doors. They are manufactured as full or in glazed versions - the glazing is also produced as sidelights, which are manufactured in a door frame profile. Side-hung multi-purpose doors are mainly manufactured as internal closings with no fire grade, but there are also produced fire-resistant, insulated, and acoustic doors. All door variants, irrespective of the function that they fulfil, do not visually differ from each other, which is particularly important to ensure a consistent appearance of the doors used in the building.