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Door is a panel or barrier that is used to cover a wall opening. Doors are found in almost all types of building to allow passage between the inside, outside and between the internal rooms. When doors are open they also provide light and ventilation. The main purpose of doors is to provide occupants with the space, privacy and security by regulating the access of doors. To regulate the access, the door is provided with variety of fittings ranging from simple latches to locks.

Internal doors are not just used to provide privacy to family members but they are also used to complete the internal look of one's home. There are various designs of internal doors that provide much wider option to customers to choose from in tune with their budgets and requirements. Latest designed internal doors are engineered to provide greater stability than traditional construction methods. All stiles and mid rails are constructed with pieces of laminated timbers which are glued together to provide a much stronger stile or rail which will not twist or warp.

Applying a real wood veneer to an internal door provides greater uniformity in colour and improves the appearance of the internal door. The different type of internal doors include clear pine doors, glazed internal doors, internal hardwood doors, knotty pine doors, American red oak doors, white oak doors and white doors. Internal doors are available in a range of different materials, clear pine doors, knotty pine doors, glazed doors, white doors, hardwood doors, white oak doors and American red oak doors.

Internal doors are available in four different categories such as panel, moulded, flush and fireproof doors. These doors are normally thinner than exterior doors as they are built for interior use. Internal panel doors are available in wooden panel doors or glazed panel doors. They are offered in pine, hardwood or primed white finish. The panels of the interior doors are generally made up of plywood, solid timber or glass. Internal moulded doors are shaped from a sheet of wood, plastic or fiberboard and then they are bonded to a timber frame. They are popular for both new and refurbish jobs. These doors are available in classic design with moulded panels and are available ready finish.

Flush internal doors are lighter and cheaper and consist of a narrow timber framework completely covered with either hardboard or plywood on both sides. Inside the frame, it can be solid chipboard, semi-solid filled with strips of timber or a cellular core of paper honeycomb. These types of internal doors have narrow lippings, although some are reinforced in positions where hinges or locks can be fitted. A fire resistant internal door is thicker and contains heavy grade chipboard or a heavy core of fire resisting compressed straw. This further helps internal doors to have around 30 to 60 minutes of fire resistance. They are usually flush robust doors that should always be fitted into a hardwood one-piece rebated frame and fitted with an automatic door closer.