Doors belong in and on every building, from commercial to residential and everything in between. The type of door installed on a building depends on what the building is used for and how many people will be going through the door. Here are three types of doors and some of the ways that they function. 

1. Interior Doors

Interior doors typically refer to doors on the inside of a house and provide privacy to the bedrooms and bathrooms in the house. Unlike exterior doors, interior doors do not always come with locks already installed. Office buildings also contain interior doors leading to private offices, conference rooms, bathrooms, and break areas. Interior doors in offices and other public buildings sometimes have windows on them so that you can see if the area behind a closed door is occupied or not before knocking or opening. 

2. Exterior Doors

Exterior doors are the doors that lead to the outside from the interior of a building. They are used for security and to protect the inside of the building from the elements, such as heat, cold, wind, and rain. Exterior doors may be decorated with ornate panels and windows, especially ones that lead to the inside of a home.

One type of exterior door is the revolving door code compliance, which involves three or four doors that rotate within a cylindrical enclosure. Revolving doors are often used for entry into sizable office buildings since they allow large numbers of people to enter and exit a building safely. Some revolving doors only allow traffic to go in one direction, a variation seen in places that require higher-than-average security such as airports. 

3. Sliding Barn Doors

Sliding barn doors are not necessarily only found in a barn but can be installed in a home as well. Sliding doors are easier to install in tight spaces than conventional interior doors since they do not require any space to swing outwards. They are also functional and may be especially welcome for those who use a walker or wheelchair to get around. Sliding doors are ideal if you have large furniture or other equipment to move in and out of rooms. Besides being functional, sliding barn doors provide a unique style to a home that cannot be found in conventional doors. 

The next time you enter or exit a building, consider if you are walking through one of these three types of doors.