Entrance doors are wooden and metal. A good front door should have the following qualities:
Protection against gross exposure using a certain margin of strength;
Protection against intellectual exposure by means of a thoughtful design and the presence of a lock in the door;
The availability of access control in the form of an eye, glass or video surveillance system;
Good sound insulation that prevents the penetration of noise;
High -quality thermal insulation for heat conservation;
Beautiful appearance.
For the manufacture of entrance doors, durable materials are used. As a rule, it is steel, wood and a combination of wood with fiberboard, chipboard faner. Today, wooden doors do not meet all the requirements for security. Therefore, steel doors are mainly in demand. The design of the steel door consists of the following parts:
Steel sheets on the outer and inside of the door should be solid. If the sheets are cooked, then during the shock the seams are necessarily cracking;
The platbands must close the gap between the door and the opening in which the box is located. If the platband is absent, turn the door with a crowbar is not difficult;
Mandatory the availability of transfers on the door and box. They are designed to close the gap between the door and the door frame;
The thickness of the sheets of steel. Doors made of sheets of light steel 1-1.5 mm, they can be won, but they will not break. There are doors and from sheets of steel 3-4 mm thick, such doors are very heavy, they are mainly used in country cottages.
Inside the steel door, a set of sections and struts to increase strength. Sometimes for additional protection inside the ribs of stiffness is a steel sheet. The soundproofing material consists of polystyrene, mineral wool, foam rubber, wooden bars and sawdust. The rubber gasket around the perimeter of the front door will protect against unpleasant odors on the site.
The door box should be of high quality and durable. When hacking, the main load falls on the door frame, so it is very important that the door box should be well fixed. Door hinges are an important element, it is easy to cut them off. Therefore, it is recommended to put special pins that are mounted in the wall through the box and protect the door from the removal.
If it is assumed that the door should open more than 50 times a day, then you should put not two, but three or even four loops.