Door


A door is a hinged or otherwise movable barrier that allows ingress into and egress from an enclosure. The opening in the wall is a doorway or portal. A door's essential and primary purpose is to provide security by controlling access to the doorway. Conventionally, it is a panel that fits into the portal of a building, room, or vehicle. Doors are generally made of a material suited to the door's task. Doors are commonly attached by hinges, but can move by other means, such as slides or counterbalancing.
The door may be moved in various ways to allow or prevent ingress or egress. In most cases, a door's interior matches its exterior side. But in other cases the two sides are radically different.
, c. 2408 BC, painted limestone, 168 x 111.5 x 6 cm, Cleveland Museum of Art
Doors often incorporate locking mechanisms to ensure that only some people can open them. Doors can have devices such as knockers or doorbells by which people outside announce their presence. Apart from providing access into and out of a space, doors can have the secondary functions of ensuring privacy by preventing unwanted attention from outsiders, of separating areas with different functions, of allowing light to pass into and out of a space, of controlling ventilation or air drafts so that interiors may be more effectively heated or cooled, of dampening noise, and of blocking the spread of fire.
Doors may have aesthetic, symbolic, ritualistic purposes. Receiving the key to a door can signify a change in status from outsider to insider. Doors and doorways frequently appear in literature and the arts with metaphorical or allegorical import as a portent of change.

History

The earliest recorded doors appear in the paintings of Egyptian tombs, which show them as single or double doors, each of a single piece of wood. People may have believed these were doors to the afterlife, and some include designs of the afterlife. In Egypt, where the climate is intensely dry, doors weren't framed against warping, but in other countries required framed doors—which, according to Vitruvius was done with stiles and rails , the enclosed panels filled with tympana set in grooves in the stiles and rails. The stiles were the vertical boards, one of which, tenoned or hinged, is known as the hanging stile, the other as the middle or meeting stile. The horizontal cross pieces are the top rail, bottom rail, and middle or intermediate rails.
The most ancient doors were made of timber, such as those referred to in the Biblical depiction of King Solomon's temple being in olive wood, which were carved and overlaid with gold. The doors that Homer mentions appear to have been cased in silver or brass. Besides olive wood, elm, cedar, oak and cypress were used. A 5,000-year-old door has been found by archaeologists in Switzerland.
Ancient doors were hung by pivots at the top and bottom of the hanging stile, which worked in sockets in the lintel and sill, the latter in some hard stone such as basalt or granite. Those Hilprecht found at Nippur, dating from 2000 BC, were in dolerite. The tenons of the gates at Balawat were sheathed with bronze. These doors or gates were hung in two leaves, each about wide and high; they were encased with bronze bands or strips, high, covered with repoussé decoration of figures. The wood doors would seem to have been about thick, but the hanging stile was over diameter. Other sheathings of various sizes in bronze show this was a universal method adopted to protect the wood pivots. In the Hauran in Syria where timber is scarce, the doors were made of stone, and one measuring by is in the British Museum; the band on the meeting stile shows that it was one of the leaves of a double door. At Kuffeir near Bostra in Syria, Burckhardt found stone doors, high, being the entrance doors of the town. In Etruria many stone doors are referred to by Dennis.
, from the 1st century AD, similar with Neoclassical doors from the 19th century
Ancient Greek and Roman doors were either single doors, double doors, triple doors, sliding doors or folding doors, in the last case the leaves were hinged and folded back. In Eumachia, is a painting of a door with three leaves. In the tomb of Theron at Agrigentum there is a single four-panel door carved in stone. In the Blundell collection is a bas-relief of a temple with double doors, each leaf with five panels. Among existing examples, the bronze doors in the church of SS. Cosmas and Damiano, in Rome, are important examples of Roman metal work of the best period; they are in two leaves, each with two panels, and are framed in bronze. Those of the Pantheon are similar in design, with narrow horizontal panels in addition, at the top, bottom and middle. Two other bronze doors of the Roman period are in the Lateran Basilica.
The Greek scholar Heron of Alexandria created the earliest known automatic door in the 1st century AD during the era of Roman Egypt. The first foot-sensor-activated automatic door was made in China during the reign of Emperor Yang of Sui, who had one installed for his royal library. The first automatic gate operators were later created in 1206 by Arab inventor Al-Jazari.
Copper and its alloys were integral in medieval architecture. The doors of the church of the Nativity at Bethlehem are covered with plates of bronze, cut out in patterns. Those of Hagia Sophia at Constantinople, of the 8th and 9th century, are wrought in bronze, and the west doors of the cathedral of Aix-la-Chapelle, of similar manufacture, were probably brought from Constantinople, as also some of those in St. Marks, Venice. The bronze doors on the Aachen Cathedral in Germany date back to about 800 AD. Bronze baptistery doors at the Cathedral of Florence were completed in 1423 by Ghiberti. .
, from the 1st century AD
Of the 11th and 12th centuries there are numerous examples of bronze doors, the earliest being one at Hildesheim, Germany. The Hildesheim design affected the concept of Gniezno door in Poland. Of others in South Italy and Sicily, the following are the finest: in Sant Andrea, Amalfi ; Salerno ; Canosa ; Troia, two doors ; Ravello, by Barisano of Trani, who also made doors for Trani cathedral; and in Monreale and Pisa cathedrals, by Bonano of Pisa. In all these cases the hanging stile had pivots at the top and bottom. The exact period when builder moved to the hinge is unknown, but the change apparently brought about another method of strengthening and decorating doors—wrought-iron bands of various designs. As a rule, three bands with ornamental work constitute the hinges, with rings outside the hanging stiles that fit on vertical tenons set into the masonry or wooden frame. There is an early example of the 12th century in Lincoln. In France, the metal work of the doors of Notre Dame at Paris is a beautiful example, but many others exist throughout France and England.
In Italy, celebrated doors include those of the Battistero di San Giovanni, which are all in bronze—including the door frames. The modeling of the figures, birds and foliage of the south doorway, by Andrea Pisano, and of the east doorway by Ghiberti, are of great beauty. In the north door, Ghiberti adopted the same scheme of design for the paneling and figure subjects as Andrea Pisano, but in the east door, the rectangular panels are all filled, with bas-reliefs that illustrate Scripture subjects and innumerable figures. These may the gates of Paradise of which Michelangelo speaks.
Doors of the mosques in Cairo were of two kinds: those externally cased with sheets of bronze or iron, cut in decorative patterns, and incised or inlaid, with bosses in relief; and those of wood framed with interlaced square and diamond designs. The latter design is Coptic in origin. The doors of the palace at Palermo, which were made by Saracenic workmen for the Normans, are fine examples in good preservation. A somewhat similar decorative class of door is found in Verona, where the edges of the stiles and rails are beveled and notched.
elements, from the Singer House
In the Renaissance period, Italian doors are quite simple, their architects trusting more to the doorways for effect; but in France and Germany the contrary is the case, the doors being elaborately carved, especially in the Louis XIV and Louis XV periods, and sometimes with architectural features such as columns and entablatures with pediment and niches, the doorway being in plain masonry. While in Italy the tendency was to give scale by increasing the number of panels, in France the contrary seems to have been the rule; and one of the great doors at Fontainebleau, which is in two leaves, is entirely carried out as if consisting of one great panel only.
The earliest Renaissance doors in France are those of the cathedral of St. Sauveur at Aix. In the lower panels there are figures. high in Gothic niches, and in the upper panels a double range of niches with figures about. high with canopies over them, all carved in cedar. The south door of Beauvais Cathedral is in some respects the finest in France; the upper panels are carved in high relief with figure subjects and canopies over them. The doors of the church at Gisors are carved with figures in niches subdivided by classic pilasters superimposed. In St. Maclou at Rouen are three magnificently carved doors; those by Jean Goujon have figures in niches on each side, and others in a group of great beauty in the center. The other doors, probably about forty to fifty years later, are enriched with bas-reliefs, landscapes, figures and elaborate interlaced borders.
NASA's Vehicle Assembly Building at the Kennedy Space Center contains the four largest doors. The Vehicle Assembly Building was originally built for the assembly of the Apollo missions' Saturn vehicles and was then used to support Space Shuttle operations. Each of the four doors are 139 meters high.
The oldest door in England can be found in Westminster Abbey and dates from 1050. In England in the 17th century the door panels were raised with bolection or projecting moldings, sometimes richly carved, round them; in the 18th century the moldings worked on the stiles and rails were carved with the egg and tongue ornament.

Design and styles

There are many kinds of doors, with different purposes. The most common type is the single-leaf door, which consists of a single rigid panel that fills the doorway. There are many variations on this basic design, such as the double-leaf door or double door and French windows, which have two adjacent independent panels hinged on each side of the doorway.

Hinged doors

Most doors are hinged along one side to allow the door to pivot away from the doorway in one direction, but not the other. The axis of rotation is usually vertical. In some cases, such as hinged garage doors, the axis may be horizontal, above the door opening.
Doors can be hinged so that the axis of rotation is not in the plane of the door to reduce the space required on the side to which the door opens. This requires a mechanism so that the axis of rotation is on the side other than that in which the door opens. This is sometimes the case in trains or airplanes, such as for the door to the toilet, which opens inward.
A swing door has special single-action hinges that allow it to open either outwards or inwards, and is usually sprung to keep it closed.
French doors are derived from an original French design called the casement door. It is a door with lites where all or some panels would be in a casement door. A French door traditionally has a moulded panel at the bottom of the door. It is called a French window when used in a pair as double-leaved doors with large glass panels in each door leaf, and in which the doors may swing out as well as in.
A Mead door, developed by S Mead of Leicester, swings both ways. It is susceptible to forced entry due to its design.
A Dutch door or stable door consists of two halves. The top half operates independently from the bottom half. A variant exists in which opening the top part separately is possible, but because the lower part has a lip on the inside, closing the top part, while leaving the lower part open, is not.
A garden door resembles a French window, but is more secure because only one door is operable. The hinge of the operating door is next to the adjacent fixed door and the latch is located at the wall opening jamb rather than between the two doors or with the use of an espagnolette bolt.

Sliding doors

It is often useful to have doors which slide along tracks, often for space or aesthetic considerations.
A bypass door is a door unit that has two or more sections. The doors can slide in either direction along one axis on parallel overhead tracks, sliding past each other. They are most commonly used in closets to provide access one side of the closet at a time. Doors in a bypass unit overlap slightly when viewed from the front so they don't have a visible gap when closed.
Doors which slide inside a wall cavity are called pocket doors. This type of door is used in tight spaces where privacy is also required. The door slab is mounted to roller and a track at the top of the door and slides inside a wall.
Sliding glass doors are common in many houses, particularly as an entrance to the backyard. Such doors are also popular for use for the entrances to commercial structures, although they are not counted as fire exit doors. The door that moves is called the "active leaf", while the door that remains fixed is called the "inactive leaf".

Rotating doors

A revolving door has several wings or leaves, generally four, radiating from a central shaft, forming compartments that rotate about a vertical axis. A revolving door allows people to pass in both directions without colliding, and forms an airlock maintaining a seal between inside and out.
A pivot door, instead of hinges, is supported on a bearing some distance away from the edge, so that there is more or less of a gap on the pivot side as well as the opening side. In some cases the pivot is central, creating two equal openings.

High-speed door

A high-speed door is a very fast door some with opening speeds of up to 4 m/s, mainly used in the industrial sector where the speed of a door has an effect on production logistics, temperature and pressure control. high-speed clean room doors are used in pharmaceutical industries for the special curtain and stainless steel frames. They guarantee the tightness of all accesses. The powerful high-speed doors have a smooth surface structure and no protruding edges. Therefore, they can be easily cleaned and depositing of particles is largely excluded.
High-speed doors are made to handle a high number of openings, generally more than 200,000 a year. They must be built with heavy duty parts and counterbalance systems for speed enhancement and emergency opening function. The door curtain was originally made of PVC, but was later also developed in aluminium and acrylic glass sections. High Speed refrigeration and cold room doors with excellent insulation values was also introduced with the Green and Energy saving requirements.
In North America, the Door and Access Systems Manufacturing Association defines high-performance doors as non-residential, powered doors, characterized by rolling, folding, sliding or swinging action, that are either high-cycle or high-speed, and two out of three of the following: made-to-order for exact size and custom features, able to withstand equipment impact, or able to sustain heavy use with minimal maintenance.

Automatic

Automatically opening doors are powered open and closed either by electricity, spring, or both. There are several methods by which an automatically opening door is activated:
  1. A sensor detects traffic is approaching. Sensors for automatic doors are generally:
  2. * A pressure sensor – e.g., a floor mat which reacts to the pressure of someone standing on it.
  3. * An infrared curtain or beam which shines invisible light onto sensors; if someone or something blocks the beam the door is triggered open.
  4. * A motion sensor which uses low-power microwave radar for the same effect.
  5. * A remote sensor can be triggered by a portable remote control, or is installed inside a vehicle. These are popular for garage doors.
  6. A switch is operated manually, perhaps after security checks. This can be a push button switch or a swipe card.
  7. The act of pushing or pulling the door triggers the open and close cycle. These are also known as power-assisted doors.
In addition to activation sensors, automatically opening doors are generally fitted with safety sensors. These are usually an infrared curtain or beam, but can be a pressure mat fitted on the swing side of the door. The safety sensor prevents the door from colliding with an object by stopping or slowing its motion. A mechanism in modern automatic doors ensures that the door can open in a power failure.

Others

Up-and-over or overhead doors are often used in garages. Instead of hinges, it has a mechanism, often counterbalanced or sprung, so it can lift and rest horizontally above the opening. A roller shutter or sectional overhead door is one variant of this type.
A tambour door or roller door is an up-and-over door made of narrow horizontal slats and "rolls" up and down by sliding along vertical tracks and is typically found in entertainment centres and cabinets.
Inward opening doors are doors that can only be opened from outside a building. Such doors pose a substantial fire risk to occupants of occupied buildings when they are locked. As such doors can only be forced open from the outside, building occupants would be prevented from escaping. In commercial and retail situations, manufacturers include a mechanism that lets an inward opening door open outwards in an emergency. This is called a 'breakaway' feature. Pushing the door outward at its closed position, through a switch mechanism, disconnects power to the latch and lets the door swing outward. Returning the door to the closed position restores power.
Rebated doors, a term chiefly used in Britain, are double doors having a lip or overlap on the vertical edge where they meet. Fire-rating can be achieved with an applied edge-guard or astragal molding on the meeting stile, in accordance with the American Fire door.
Evolution Door is a trackless door that moves in the same closure level as a sliding door. The system is an invention of the Austrian artist Klemens Torggler. It is a further development of the that normally consists of two rotatable, connected panels which move to each other when opening.

Applications

Architectural doors have numerous general and specialized uses. Doors are generally used to separate interior spaces for convenience, privacy, safety, and security reasons. Doors are also used to secure passages into a building from the exterior, for reasons of climate control and safety.
Doors also are applied in more specialized cases:

Panel doors

Panel doors, also called stile and rail doors, are built with frame and panel construction. EN 12519 is describing the terms which are officially used in European Member States. The main parts are listed below:
Also known as ledges and braced,
Board and batten doors are an older design consisting primarily of vertical slats:
As board and Batten doors

Impact-resistant doors

Impact-resistant doors have rounded stile edges to dissipate energy and minimize edge chipping, scratching and denting. The formed edges are often made of an engineered material. Impact-resistant doors excel in high traffic areas such as hospitals, schools, hotels and coastal areas.

Frame and filled doors

This type consists of a solid timber frame, filled on one face, face with Tongue and Grooved boards. Quite often used externally with the boards on the weather face.

Flush doors

Many modern doors, including most interior doors, are flush doors:
Door swings
door in Bucharest, with a mascaron above it
For most of the world, door swings, or handing, are determined while standing on the outside or less secure side of the door while facing the door.
It is important to get the hand and swing correct on exterior doors, as the transom is usually sloped and sealed to resist water entry, and properly drain. In some custom millwork, the manufacture or installer bevels the leading edge so that the door fits tight without binding. Specifying an incorrect hand or swing can make the door bind, not close properly, or leak. Fixing this error is expensive or time-consuming. In North America, many doors now come with factory-installed hinges, pre-hung on the jamb and sills.
While facing the door from the outside or less secure side, if the hinge is on the right side of the door, the door is "right handed"; or if the hinge is on the left, it is "left handed". If the door swings toward you, it is "reverse swing"; or if the door swings away from you, it is "Normal swing".
In other words,
One of the oldest DIN standard applies: DIN 107 "Building construction; identification of right and left side" defines that doors are categorized from the side where the door hinges can be seen. If the hinges are on the left, it is a DIN Left door, if the hinges are on the right, it is a DIN Right door. The DIN Right and DIN Left marking are also used to categorize matching installation material such as mortise locks. The European Standard DIN EN 12519 "Windows and pedestrian doors. Terminology" includes these definitions of orientation.
The "refrigerator rule" applies, and a refrigerator door is not opened from the inside. If the hinges are on the right then it is a right hand door.
In public buildings, exterior doors open to the outside to comply with applicable fire codes. In a fire, a door that opens inward could cause a crush of people who can't open it.

Types

New exterior doors are largely defined by the type of materials they are made from: wood, steel, fiberglass, UPVC/vinyl, aluminum, composite, glass...

Wooden doors – including solid wood doors – are a top choice for many homeowners, largely because of the aesthetic qualities of wood. Many wood doors are custom-made, but they have several downsides: their price, their maintenance requirements and their limited insulating value. Wood doors often have an overhang requirement to maintain a warranty. An overhang is a roof, porch area or awning that helps to protect the door and its finish from UV rays.
Steel doors are another major type of residential front doors; most of them come with a polyurethane or other type of foam insulation core – a critical factor in a building's overall comfort and efficiency. Steel doors mostly in default comes along with frame and lock system, which is a high cost efficiency factor compared to Wooden doors
Most modern exterior walls provide thermal insulation and energy efficiency, which can be indicated by the Energy Star label or the Passive House standards. Premium composite, fiberglass and vinyl doors benefit from the materials they are made from, from a thermal perspective.

Insulation and weatherstrips

But there are very few door models with an R-value close to 10. Typical doors are not thick enough to provide very high levels of energy efficiency.
Many doors may have good R-values at their center, but their overall energy efficiency is reduced because of the presence of glass and reinforcing elements, or because of poor weatherstripping and the way the door is manufactured.
Door weatherstripping is particularly important for energy efficiency. German-made passive house doors use multiple weatherstrips, including magnetic strips, to meet higher standards. These weatherstrips reduce energy losses due to air leakage.

Dimensions

United States

Standard door sizes in the US run along 2" increments. Customary sizes have a height of 78" or 80" and a width of 18", 24", 26", 28", 30" or 36". Most residential passage doors are 30" x 80".
A standard US residential door size is 36" x 80". Interior doors for wheelchair access must also have a minimum width of 3'-0". Residential interior doors are often somewhat smaller being 6'-8" high, as are many small stores, offices, and other light commercial buildings. Larger commercial, public buildings and grand homes often use doors of greater height. Older buildings often have smaller doors.
Thickness: Most pre-fabricated doors are 1 3/8" thick or 1 3/4".
Closets: small spaces such as closets, dressing rooms, half-baths, storage rooms, cellars, etc. often are accessed through doors smaller than passage doors in one or both dimensions but similar in design.
Garages: Garage doors are generally 7'-0" or 8'-0" wide for a single-car opening. Two car garage doors are a single door 16'-0". Because of size and weight these doors are usually sectional. That is split into four or five horizontal sections so that they can be raised more easily and don't require a lot of additional space above the door when opening and closing. Single piece double garage doors are common in some older homes.

Europe

Standard DIN doors are defined in DIN 18101. Door sizes are also given in the construction standard for wooden door panels. The DIN commission created the harmonized European standard DIN EN 14351-1 for exterior doors and DIN EN 14351-2 for interior doors, which define requirements for the CE marking and provide standard sizes by examples in the appendix.
The DIN 18101 standard has a normative size slightly larger than the panel size as the standard derives the panel sizes from the normative size being different single door vs double door and molded vs unmolded doors. DIN 18101/1985 defines interior single molded doors to have a common panel height of 1985 mm at panel widths of 610 mm, 735 mm, 860 mm, 985 mm, 1110 mm, plus a larger door panel size of 1110 mm x 2110 mm. The newer DIN 18101/2014 drops the definition of just five standard door sizes in favor of a basic raster running along 125 mm increments where the height and width are independent. Panel width may be in the range 485 mm to 1360 mmm, and the height may be in the range of 1610 mm to 2735 mm. The most common interior door is 860 mm x 1985 mm.

Doorway components

When framed in wood for snug fitting of a door, the doorway consists of two vertical jambs on either side, a lintel or head jamb at the top, and perhaps a threshold at the bottom. When a door has more than one movable section, one of the sections may be called a leaf. See door furniture for a discussion of attachments to doors such as door handles, doorknobs, and door knockers.
Door furniture or hardware refers to any of the items that are attached to a door or a drawer to enhance its functionality or appearance. This includes items such as hinges, handles, door stops, etc.

Related accidents

Door safety relates to prevention of door-related accidents. Such accidents take place in various forms, and in a number of locations; ranging from car doors to garage doors. Accidents vary in severity and frequency. According to the National Safety Council in the United States, 300,000 injuries are caused by doors every year.
The types of accidents vary from relatively minor cases where doors cause damage to other objects, such as walls, to serious cases resulting in human injury, particularly to fingers, hands, and feet. A closing door can exert up to 40 tons per square inch of pressure between the hinges. Because of the number of accidents taking place, there has been a surge in the number of lawsuits. Thus organisations may be at risk when car doors or doors within buildings are unprotected.
According to the US General Services Administration, discussing child care centres:

Outward and inward opening

Whenever a door is opened outwards there is a risk that it could strike another person. In many cases this can be avoided by architectural design which favors doors which open inwards into rooms. In cases where this is infeasible, it may be possible to avoid an accident by placing vision panels in the door.
However, inward-hinged doors can also escalate an accident by preventing people from escaping the building: people inside the building may press against the doors, and thus prevent the doors from opening. Related accidents include:
Today, the exterior doors of most large buildings open outward, while interior doors such as doors to individual rooms, offices, suites, etc. open inward, as do many exterior doors of houses, particularly in North America.

Doorstops

s are simple devices that prevent a door from contacting and possibly damaging another object. They may either absorb the force of a moving door, or hold the door against unintended motion.

Door guards

Door guards help prevent finger trapping accidents, as doors pose a risk to children, especially when closing. Door guards protect fingers in door hinges by covering the hinge-side gap of an open door, typically with a piece of rubber or plastic that wraps from the door frame to the door. Other door safety products eject the fingers from the push side of the door as it closes.
There are various levels of door protection. There may a front anti-finger trapping device but with the rear hinge pin side of the door left unprotected. Full door protection uses front and rear anti-finger trapping devices and ensures the hinge side of a door is fully isolated. A risk assessment of the door determines the appropriate level of protection.
There is also handle-side door protection, which prevents the door from slamming shut on the frame, which can cause injury to fingers/hands.

Safety doors

A safety door prevents finger injuries near the hinges without using door guards. Rather than cover the danger area, the shape of the door changes to prevent an accessible gap forming the first place. A circular extension to the door moves in and out of a cavity as the door opens and closes. This prevents someone from injuring any part of a hand near the hinges—inside or outside. These doors have an operating range of slightly over 90 degrees, so their use is limited to where they come into contact with a side wall when fully open.

Glass doors

pose the risk of unintentional collision if a person is unaware there is a door, or thinks it is open when it is not. This risk is greater with sliding glass doors because they often have large single panes that are hard to see. Stickers or other types of warnings on the glass surface make it more visible and help prevent injury. In the UK, Regulation 14 of the Workplace 1992 requires that builders mark windows and glass doors to make them conspicuous. Australian Standards: AS1288 and AS2208 require that glass doors be made of laminated, tempered, or toughened glass.

Fire

Buildings often have special purpose doors that automatically close to prevent the spread of fire and smoke. Fire doors that are improperly installed or tampered with can increase risk during a fire. Sometimes, door closer mechanisms ensure fire doors remain closed.
An additional fire risk is that doors may prevent access to emergency services personnel coming to fight the fire and rescue occupants, etc. Fire fighters must use door breaching techniques in these situations to gain access.
Doors in public buildings often have panic bars, which open the door in response to anyone pressing against the bar from the inside in the event of a fire or other emergency.

Vehicle doors

Vehicle doors present an increased risk of trapping hands or fingers due to the proximity of occupants. In some car accidents, injury to occupants from the movement of car doors occurs.
Bicyclists cycling on public roads risk dooring: collision with an abruptly opened vehicle door. Because cyclists often ride near parked cars alongside the road, they are particularly vulnerable.

Aircraft doors

In aircraft, doors from pressurized sections to un-pressurized compartments or the exterior can pose risk if they open during flight. Air may rush out of the fuselage with sufficient velocity to eject unsecured occupants, cargo, and other items, and drastic pressure differences between compartments may make aircraft floors or other interior partitions fail. These concerns are typically mitigated with plug doors, which open in towards the pressurized compartment and are forced into their door frames by the difference in air pressure. Most cabin doors are of this type, but cargo doors typically open outward to maximise interior space, and require hefty locking mechanisms to overcome internal pressure and prevent explosive decompression.
A number of aircraft accidents involved outward-opening door failures, including: