A door is a hinged cover to an opening in a wall, it is classified according to where it is used.
Doors used in entering a building are called external doors, while doors used within a building are called internal doors.

Doors can be further classified by their method of operation which are:
• Hinged or swinging doors.
• Sliding doors.
• Folding doors (these are also hinged).

It’s main functions are:

• To allow access into a building.
• To allow access to other parts of a building.
• To prevent outside elements such as rain and dust from entering the building.
• To prevent the passage of fire from one room to the next.
• To provide a thermal and sound insulation barrier.
• To offer security and privacy.

Here are Few Types of Doors:

Energy efficient doors

Energy efficient doors today have become common and favorite among other types of doors. The materials used in energy efficient doors are wood, steel and fiberglass which certainly helps to save the units of power since they have insulating foam inside.

Wooden doors

Wooden doors look elegant and serves the most important function of protecting us against cold winds, but this is only if they are made of hard and good wood. Wood is considered a good insulator against cold and heat making it energy efficient. One can install different kinds of wooden door but the thing to remember is wood chosen must be hard and long lasting otherwise you may end up changing the doors for ever because cheap wood gets rotten and most times not termite proof.

There are many advantages of wooden doors which are:
• Wood is renewable - Wood is recyclable which makes it harmless and sustainable. Wood is the one thing which can be renewable and converted into another thing or furniture piece out of the old wood without harming the forest.
• Various types of wood - To grant your doors a distinctive look you can choose from the following wood: oak, pine, walnut, mahogany, maple, cherry, fir and many more. If you are going for some other wood make sure the wood is hard and long lasting.
• Wood is an excellent insulator - Due to this characteristic of wood it is the best protector against wind, heat, and cold.

Wooden doors are prone to getting rotten and warped, thus it is necessary to varnish or seal the door with some protectants in order to save them from bad weather, water and direct sunlight. This concealer has to be reapplied in every two years to save it from rotting.

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Tell me please, is there any difference between the quality of home and office windows? Or are these designs the same?