The properties of the field that will be used, necessarily you should review when deciding your size and needs. Doors, external doors and internal doors of the properties if they are different, the standards are different, the assembly are also different. Interior doors exterior doors should be quality documents and standards. The doors are to be purchased, materials, accessories and world class after sales support. Must have certificate and Warranty the warranty period must be stated.
Doors are supplied from domestic producers and foreign markets. Door manufacturers, must have the necessary quality certificates and world standards in production. Exterior doors and interior doors that you will purchase must have passed the quality control tests. After-sales service and warranty conditions provided by the manufacturer, if not necessarily, you should request detailed information from the manufacturer, and written documents.