ACOUSTICS
The study and management of sound within a building environment. In the context of fire doors, acoustics is critical to ensure that the door not only provides fire resistance but also maintains soundproofing capabilities to enhance occupant comfort and privacy.

ADHESIVE
A bonding agent used in the assembly of fire doors, particularly where multiple layers of materials are combined to create a fire-resistant barrier. The adhesive must be heat-resistant to prevent delamination under high temperatures, maintaining the door's structural integrity during a fire.

AESTHETICS
The design elements of fire doors that balance functionality with visual appeal. Modern fire doors must not only meet stringent fire safety standards but also integrate seamlessly with the architectural style of a building, often featuring wood veneers, glass panels, or custom finishes.

ALUMINIUM
A lightweight, durable metal used in the construction of door frames and windows. Aluminium’s ability to be extruded into complex shapes make it ideal for a wide range of industries, providing both structural support and a sleek finish.

ARCHITECTURAL FIRE DOOR
A specialized type of door engineered to prevent the spread of fire and smoke within a building. These doors are constructed to meet higher standards than ordinary doors, often featuring materials like mineral cores, steel reinforcements, and intumescent seals that expand under heat to block gaps.

ASTRAGAL
A vertical molding attached to the meeting edge of a pair of fire doors. The astragal is essential for preventing smoke and flames from passing through the gap between the doors, ensuring that the fire barrier remains intact. In some designs, it may also house additional intumescent seals or automatic drop seals.

AIR TRANSFER GRILLIE 
Essential components in maintaining proper airflow and ventilation in buildings, especially in fire-rated environments. These grilles are designed to allow air to circulate between rooms while maintaining fire and smoke barriers, ensuring that fire protection measures are not compromised.

BACKFILLING
Factory backfilling of fire-rated  door frames is a process which entails filling gaps around the frame with specialized fire-resistant materials. Backfilling ensures a tight seal, preventing fire and smoke spread, and reinforces the frame's structural integrity, safeguarding occupants and property.

BACKSET
The distance from the edge of the door to the center of the keyhole or spindle of a lock, which is critical in ensuring that fire-rated locks are correctly positioned to maintain the integrity of the fire door. The backset must be compatible with the door’s design to ensure both safety and ease of use.

BALLON FRAME
An outdated method of wood-frame construction that lacks fire-stopping measures between floors, now replaced by platform framing in modern construction. However, understanding historical construction methods like balloon framing is important when retrofitting older buildings with modern fire doors and barriers.

BASE MOULDING
A decorative and protective molding installed at the base of a wall. In fire door installations, base molding must be non-combustible or fire-retardant, especially in high-risk areas, to prevent fire from spreading through wall joints or along the floor.

BIFOLD FIRE DOOR
A door system composed of multiple panels that fold together. In fire-rated applications, bifold doors are designed with special hinges and seals to ensure that when closed, they provide a continuous fire barrier. These doors are often used in large openings where space-saving solutions are needed.

BUILDING CODE
A set of regulations that prescribe the minimum standards for construction, including fire safety. Building codes, such as the National Construction Code (NCC) in Australia, dictate the specifications for fire doors, including their required fire resistance level, installation methods, and maintenance.

CARBON STEEL
A type of steel that contains a higher carbon content, making it stronger and more durable. In fire door applications, carbon steel is often used in hinges, locks, and reinforcement plates to ensure that these components remain functional even when exposed to extreme heat.

CASING
The trim or molding surrounding a door or window, which in fire-rated assemblies, must also meet fire-resistance standards. The casing plays a dual role in aesthetics and functionality, as it seals the gap between the door frame and wall to prevent the spread of fire and smoke.

CHECKING AND SPLITTING
Terms used to describe defects in wood that can compromise the fire-resistance of a door. Checking refers to cracks that develop along the wood’s grain, while splitting involves the wood breaking apart. Both conditions must be minimized in fire-rated doors to ensure they meet safety standards.

CLAD
To cover or sheathe a surface, often with a protective layer of metal or another non-combustible material. Fire doors may be clad in steel, aluminum, or fiberglass to provide additional fire resistance and durability, particularly in high-traffic or industrial environments.

COLD PRESS
A method of applying pressure to bond materials without using heat. In fire door manufacturing, cold pressing is used to laminate fire-resistant cores with veneers or other surface materials, ensuring that the adhesive remains stable under fire conditions.

COMBUSTIBLE
A material that can ignite and burn when exposed to fire. In fire safety, it's essential to minimize the use of combustible materials in door construction, particularly in the core and surface layers of fire-rated doors. Non-combustible or fire-retardant materials are preferred to maintain fire resistance.

COMPLIANCE
Adherence to regulatory standards, such as AS1905.1 in Australia, which specifies the performance requirements for fire doors. Compliance ensures that fire doors are tested, certified, and installed according to national and local building codes, providing reliable protection in the event of a fire.

CONCAVE
A surface that curves inward, similar to the inside of a bowl. In fire door applications, concave profiles may be used in molding or seals that need to accommodate expansion and contraction without compromising the fire barrier.

CONVECTION
The transfer of heat through the movement of fluids (liquids or gases), a critical concept in fire safety. Fire doors are designed to limit heat transfer by convection, preventing the spread of fire from one area to another. This is achieved through the use of insulation, air-tight seals, and fire-resistant materials.

CORE
The internal structure of a fire door, which can be made from a variety of fire-resistant materials, such as mineral fiber, vermiculite, or wood-based composites. The core is crucial for the door’s fire rating, as it determines how long the door can withstand fire exposure without failing.

DOOR BEVEL
An angled cut on the edge of a door that allows it to swing smoothly within its frame. In fire doors, the bevel must be precisely cut to ensure that the door closes tightly, preventing the passage of smoke and flames.

DOOR CLOSER
A mechanical device that automatically closes a door after it has been opened, essential for maintaining the fire barrier. Door closers used on fire doors are typically tested to ensure they can withstand the heat and continue functioning during a fire, preventing the door from being left open.

DOOR CORE
The central material within a fire door, designed to resist fire and prevent heat transfer. Common core materials include solid timber, mineral cores, or engineered wood products, all selected for their ability to maintain structural integrity under fire conditions.

DOOR FRAME
The supporting structure around a door, typically made from steel, aluminum, or fire-rated timber. The frame must be as fire-resistant as the door itself to prevent the spread of fire and smoke. Frames often include intumescent seals that expand when exposed to heat, sealing gaps between the door and frame.

DOOR JAMB
The vertical portion of the door frame to which the door is hinged. In fire door assemblies, the jamb must be robust enough to support the door's weight and withstand the pressures exerted during a fire, often reinforced with steel or additional fire-resistant materials.

DOOR LIMITER
A device that restricts how far a door can open, often used in conjunction with fire doors to prevent them from being forced open beyond a certain point, which could compromise the fire barrier.

DOOR PANEL
The flat surface of a door that makes up its main structure. Fire-rated door panels are often made from layers of fire-resistant materials, including metal sheets, reinforced glass, or specialized fire-retardant cores, to provide the necessary protection against fire.

DOOR SKIN
The outer surface layer of a fire door, which may be made from materials like steel, aluminum, fiberglass, or fire-resistant wood veneers. The skin not only provides aesthetic appeal but also contributes to the door's overall fire resistance by protecting the core from direct flame exposure.

DOUBLE ACTION DOOR
A door that swings both ways, commonly found in commercial settings. When used as a fire door, double-action mechanisms must be carefully designed to ensure that the door closes securely in either direction, maintaining a continuous fire barrier.

DYNA BOLT
A type of bolt frequently used in construction and related industries for anchoring structures to concrete or masonry surfaces. These versatile and durable fasteners are engineered to deliver a strong and dependable grip on the base material, making them an excellent choice for various applications.

EASED EDGE
A slightly rounded or beveled edge on a door, which helps prevent splintering and improves the door's durability. In fire doors, eased edges also ensure a smoother fit within the frame, reducing the likelihood of gaps that could allow smoke or fire to pass through.

ELECTRIC STRIKE
An electronic device used to secure a door in a fire-rated assembly, allowing it to be opened remotely, typically in response to a fire alarm system. Electric strikes used in fire doors must be fail-safe, meaning they unlock in the event of a power failure to ensure safe egress during an emergency.

END JOINT
A type of joint used in wood door construction where two pieces of wood are joined at their ends. For fire doors, end joints must be strong and heat-resistant to ensure the door's integrity under fire conditions, often reinforced with fire-resistant adhesives or mechanical fasteners.

EXTERIOR THRESHOLD
The bottom part of a door frame that connects to the ground or floor, particularly important in exterior fire doors to prevent water ingress and maintain the door's fire resistance. Thresholds must be made from non-combustible materials and designed to create a tight seal when the door is closed.

FACADE
The front or outer face of a building. In fire safety, the facade often includes fire-rated cladding or materials that prevent the spread of fire from the building’s exterior to the interior, ensuring that the facade contributes to the overall fire safety strategy.

FACEPLATE
The visible part of a lock or latch mechanism that is mounted on the edge of a door. In fire-rated doors, the faceplate must be made from non-combustible materials and designed to prevent the mechanism from failing when exposed to high temperatures.

FIBERGLASS
A composite material made from fine glass fibers, often used in the construction of fire-resistant door skins or panels. Fiberglass is valued for its strength, lightweight properties, and resistance to heat, making it an excellent choice for fire door applications.

FINGER JOINTING
A method of joining pieces of wood where the ends are cut into a series of interlocking fingers. This technique is used in fire door construction to create strong, durable joints that maintain their integrity under fire conditions.

FIRE DOOR
A door specifically engineered to resist the spread of fire and smoke, critical in maintaining fire compartments within a building. Fire doors are rated based on how long they can withstand fire exposure, with common ratings of 30, 60, or 90 minutes. These doors are an essential component of a building's passive fire protection system.

FIRE RESISTANT
A term describing materials or structures that can withstand exposure to fire without combusting or losing their structural integrity. Fire-resistant materials are used in the construction of fire doors, frames, and seals to prevent the spread of fire and protect building occupants.

FIRE RESISTANCE LEVEL (FRL)
The classification given to fire doors and other fire-resistant materials based on their ability to withstand fire for a specified time, such as 30, 60, or 90 minutes. The performance rating is critical in ensuring that fire doors meet the required safety standards for their intended use.

FIREPROOF CONSTRUCTION
Building design and construction practices aimed at preventing fire spread and maintaining structural stability during a fire. This includes the use of fire-rated doors, walls, floors, and ceilings that can withstand high temperatures and protect occupants and property.

FLASHING
A thin sheet of metal or other non-combustible material used to prevent water infiltration at joints or openings, such as where a door frame meets a wall. In fire-rated assemblies, flashing also helps maintain the fire barrier by sealing gaps that could allow fire or smoke to penetrate.

FLUSH DOOR
A door with a smooth, flat surface, often used in fire-rated applications where a sleek, modern appearance is desired. Flush fire doors may have a solid core made from fire-resistant materials, ensuring they meet the required fire rating.

FRAME
The structural elements surrounding a door or window, providing support and securing it within a wall. In fire-rated assemblies, the frame must be made from materials that can withstand fire and maintain the integrity of the fire barrier, often incorporating intumescent seals that expand to fill gaps when exposed to heat.

FURRING
Narrow strips of wood or metal attached to a surface to provide a base for additional construction materials. In fireproof construction, furring strips must be non-combustible to prevent them from compromising the fire resistance of the wall or ceiling assembly.

GASKET
A flexible seal used to create a tight seal around the edges of fire doors, preventing the passage of smoke and flames. Gaskets used in fire-rated assemblies are typically made from materials that can withstand high temperatures and maintain their sealing properties under fire conditions.

GLAZING
The process of installing glass in windows or doors. In fire-rated glazing, special fire-resistant glass is used, often incorporating layers of intumescent materials that expand and turn opaque when exposed to heat, providing a barrier to fire and smoke.

GRADE
A classification system used to describe the quality and performance of materials, including fire doors. The grade of a fire door indicates its fire resistance, durability, and suitability for different environments.

GYPSUM
A mineral used in the production of fire-resistant wallboard and other construction materials. Gypsum-based products are commonly used in the cores of fire doors and in fire-rated walls and ceilings due to their ability to resist high temperatures and prevent the spread of fire.

GAP
The space between the door and the frame or between two doors. In fire-rated doors, gaps must be minimized and sealed with intumescent materials to prevent the spread of fire and smoke.

GUARD BAR
A metal bar installed on fire doors to protect the door from damage caused by carts, trolleys, or other objects, especially in industrial or commercial settings. Guard bars must not interfere with the fire door's operation or its ability to close fully.

HANDING
The term used to describe the indication of which side of a door the hinges are placed and whether the door opens inwards or towards you.

HINGE JAMB
The side of a door frame where the hinges are attached. In fire-rated doors, the hinge jamb must be reinforced to support the weight of the door and ensure that the hinges remain secure during a fire, preventing the door from sagging or becoming misaligned.

HINGED DOOR
A door that swings open on hinges attached to one side of the frame. Fire-rated hinged doors must be designed to close automatically and create a tight seal to prevent the spread of fire and smoke, often incorporating intumescent strips along the edges.

HEAT ACTIVATED SEAL
A seal that expands when exposed to high temperatures, typically found in fire doors and frames. These seals are crucial for preventing the passage of fire and smoke through gaps around the door.

HOSE STREAM TEST
A test conducted on fire doors to assess their ability to withstand the impact of a high-pressure water stream, simulating the conditions during firefighting efforts. Fire doors must pass this test to ensure they remain intact and effective after being exposed to both fire and water.

HYDRAULIC DOOR CLOSER
A type of door closer that uses hydraulic fluid to control the speed and force with which a fire door closes. Hydraulic door closers are often used in fire-rated doors to ensure they close securely and maintain the fire barrier.

INSULATION
Materials used to prevent heat, sound, or electrical transfer. In the context of fire doors, insulation typically refers to the core materials that prevent heat transfer through the door, helping to maintain the fire barrier and protect adjacent areas from fire damage.

INTUMESCENT SEAL
A material that expands when exposed to heat, used in fire doors and frames to seal gaps and prevent the passage of fire and smoke. Intumescent seals are critical in maintaining the fire rating of a door assembly, as they ensure that even small gaps are sealed during a fire.

INTEGRITY
The ability of a fire door or other fire-resistant element to remain intact and prevent the passage of flames, smoke, and gases during a fire. Integrity is a key measure of a fire door's performance and is often tested alongside insulation and stability.

INTERMEDIATE RAIL
A horizontal member of a fire door located between the top and bottom rails. Intermediate rails provide additional support and may house locking mechanisms or other hardware.

INSPECTION
The process of regularly checking fire doors and other fire-rated elements to ensure they are functioning correctly and have not been compromised. Inspections are essential for maintaining compliance with fire safety regulations.

INTUMESCENT STRIP
A strip of material that expands when exposed to heat, used in fire doors to seal gaps around the door and prevent the spread of fire and smoke.

JAMB
The vertical parts of a door frame that support the door and provide attachment points for hinges and locks. In fire-rated assemblies, jambs must be made from fire-resistant materials and designed to maintain the integrity of the fire barrier.

JOIST
Horizontal structural elements that support floors or ceilings. In fire-resistant construction, joists may be protected with fire-rated materials or integrated with fire stops to prevent the spread of fire through floors or ceilings.

KILLER SEAL
A slang term for a type of intumescent seal that is particularly effective at expanding to fill gaps and prevent the spread of fire and smoke. The term "killer" emphasizes its effectiveness in "killing" or stopping fire from passing through.

KNOCK-DOWN FRAME
A door frame that is delivered in pieces and assembled on-site. In fire-rated applications, knock-down frames must be carefully installed to ensure they meet fire safety standards and maintain the door's fire resistance.

LIGHT REFLECTIVE VALUE (LRV)
This refers to the proportion of light that a paint color reflects.

LOCK BLOCK
A solid piece of wood or other material placed within a door to provide a secure area for mounting locks. In fire doors, the lock block must be made from fire-resistant materials to ensure that the lock remains functional and secure during a fire.

MINERAL CORE
A type of fire-resistant core material used in the construction of fire doors. Mineral cores are made from non-combustible materials that provide excellent thermal insulation and structural integrity, allowing the door to withstand fire for the required rating period.

MORTICE LOCK
A lock that is installed within a pocket, or mortice, cut into the edge of a door. Mortice locks used in fire doors must be tested and certified to ensure they can withstand the high temperatures of a fire without failing, maintaining the security of the door.

MULTI-POINT LOCK
A locking mechanism that secures a door at multiple points along its edge, providing enhanced security and ensuring a tight seal. In fire doors, multi-point locks help maintain the integrity of the fire barrier by preventing the door from warping or becoming misaligned during a fire.

NIGHTLATCH
A lock that automatically locks a door when it is closed, typically used in residential settings. In fire doors, nightlatches must be made from fire-resistant materials and designed to maintain the door's security and fire-resistance during a fire.

NON-COMBUSTIBLE
A material that does not ignite or burn when exposed to fire. Non-combustible materials are essential in the construction of fire doors, frames, and other fire-rated assemblies to prevent the spread of fire.

NOMINAL SIZE
The stated size of a door, which may differ slightly from its actual dimensions due to manufacturing tolerances. In fire door installations, it is important to ensure that the nominal size of the door matches the frame and opening to maintain the fire rating.

NYLON BRUSH SEAL
A type of seal used on fire doors to prevent the passage of smoke and air. Nylon brush seals are durable and flexible, often used in conjunction with intumescent seals for enhanced performance.

OVERHEAD CLOSER
A door closer mounted on the top of the door, used to automatically close the door after it is opened. Overhead closers are commonly used in fire doors to ensure they close securely and maintain the fire barrier.

OCCUPANT LOAD
The number of people that a building or space is designed to accommodate. Occupant load is a critical factor in determining the number and type of fire exits, including fire doors, required to ensure safe evacuation during an emergency.

PANEL DOOR
A door made with recessed panels, which can be made from wood, glass, or other materials. Fire-rated panel doors are designed to maintain their fire resistance while providing a traditional or decorative appearance.

PIVOT HINGE
A hinge that allows a door to pivot open on a single point, rather than swinging open on side-mounted hinges. Pivot hinges used in fire doors must be strong enough to support the door's weight and maintain alignment during a fire.

PLATFORM CONSTRUCTION
A modern method of wood-frame construction where each floor is built as a separate platform. This method includes built-in fire-stopping measures between floors, making it easier to install fire doors and other passive fire protection elements.

PLUMB
A term used to describe something that is perfectly vertical. In fire door installations, it is crucial that the door and frame are plumb to ensure the door closes correctly and maintains the fire barrier.

PRESSURE DIFFERENTIAL
The difference in air pressure between two sides of a fire door, which can cause smoke and gases to be drawn through gaps. Fire doors are often designed with seals and other features to manage pressure differentials and prevent the spread of fire.

PUSH BAR EXIT DEVICE
A device installed on fire doors that allows occupants to open the door quickly by pushing on a bar. Push bar exit devices are commonly used in emergency exits to ensure fast and easy egress during a fire.

QUICK RELEASE MECHANISM
A mechanism that allows a door to be quickly and easily opened in an emergency. In fire doors, quick release mechanisms are essential for ensuring that occupants can evacuate safely without delay.

QUARTER TURN LOCK
A type of lock that is engaged or disengaged with a quarter turn of the key or handle. In fire-rated doors, quarter turn locks must be made from materials that can withstand high temperatures and maintain security during a fire.

QUIET DOOR CLOSER
A door closer designed to operate smoothly and quietly, often used in environments where noise reduction is important. Quiet door closers in fire-rated doors must still provide reliable closure and maintain the fire barrier.

RADIATION SHIELDING
Materials or structures designed to block or reduce radiation, often used in conjunction with fire doors in medical or industrial settings. Radiation shielding doors may be lead-lined or made from other dense materials to protect against both radiation and fire.

RAIL
The horizontal components of a door's frame. In fire-rated doors, rails must be strong and fire-resistant to maintain the door's structural integrity during a fire.

REINFORCEMENT PLATE
A metal plate installed in a door to strengthen areas where hardware such as locks or hinges are mounted. In fire doors, reinforcement plates are made from fire-resistant materials to prevent the hardware from failing under fire conditions.

RETROFIT
The process of adding new features or technology to existing fire doors/frames or assemblies to bring them up to current standards. Retrofitting may involve adding intumescent seals, upgrading hardware, or replacing door cores with fire-resistant materials.

ROUGH OPENING
The unfinished opening in a wall where a door or window will be installed. The rough opening must be properly sized and aligned to accommodate the fire door and frame, ensuring that the assembly meets fire safety standards.

SADDLE
Another term for a threshold, the saddle is the horizontal strip that sits at the bottom of a door frame. In fire-rated doors, the saddle is designed to prevent fire and smoke from passing underneath the door, often incorporating intumescent seals or other fire-resistant materials.

SEALANT
A material used to fill gaps and joints in fire-rated assemblies to prevent the spread of fire, smoke, and toxic gases. Fire-resistant sealants are essential in maintaining the integrity of fire doors, frames, and other passive fire protection elements.

SHIM
A thin piece of material used to adjust the fit of a door within its frame. In fire-rated door installations, shims must be made from non-combustible materials to ensure they do not compromise the fire barrier.

SIDELITE
A narrow window located adjacent to a door, often found in entryways. When part of a fire-rated assembly, sidelites must be made from fire-resistant glass and framing materials to ensure they do not compromise the fire barrier.

SILL
The bottom part of a window or door frame that sits horizontally. In fire-rated doors, the sill is designed to be non-combustible and may include additional fire-resistant features to prevent the spread of fire through the bottom of the door assembly.

SLIDING FIRE DOOR
A type of fire door that opens by sliding horizontally rather than swinging open. Sliding fire doors are often used in spaces where a swinging door would be impractical, and they must be designed to close automatically in the event of a fire to maintain the fire barrier.

SNIB
A small latch or lever used to hold a door lock in place, preventing the door from closing completely. In fire-rated doors, snibs must be designed to disengage automatically during a fire to ensure the door closes and provides the necessary fire barrier.

SOLID CORE DOOR
A door with a core made from solid materials, such as timber, particleboard, or fire-resistant composites. Solid core fire doors are designed to provide superior fire resistance, often achieving ratings of 30, 60, or 90 minutes depending on the core materials and construction methods.

STAINLESS STEEL (304 and 316)
Available in brushed or polished finishes, these types of stainless steel offer superior corrosion resistance and aesthetic appeal. They are particularly suitable for high-end applications in coastal and tropical regions where corrosion risk is high, including around pools, making them ideal for steel door frames.

STILE
The vertical components of a door’s frame. In fire doors, the stiles are reinforced to maintain the door's structural integrity under fire conditions, often incorporating fire-resistant cores or metal reinforcements.

STOP
A strip of material attached to the door frame to prevent the door from swinging too far. In fire-rated doors, stops are often equipped with intumescent seals to enhance the fire barrier.

SURFACE MOUNTED CLOSER
A door closer that is mounted on the surface of the door or frame rather than being concealed within it. Surface mounted closers are commonly used in fire-rated doors to ensure they close securely and maintain the fire barrier.

THRESHOLD
A strip of material at the bottom of a door frame that helps to seal the door when closed. Fire-rated thresholds are made from non-combustible materials and are designed to prevent fire and smoke from passing underneath the door.

THERMAL BARRIER
A material or assembly that prevents the transfer of heat from one side of a structure to the other. In fire doors, thermal barriers are essential for maintaining the fire-resistance of the door and protecting adjacent areas from heat damage.

TILT AND TURN HINGE
A hinge that allows a door or window to tilt inward for ventilation or turn inward for full opening. In fire-rated applications, tilt and turn hinges must be designed to maintain the fire barrier in both positions.

TRANOM
A horizontal bar or window above a door. In fire-rated assemblies, transoms must be made from fire-resistant materials and designed to prevent the spread of fire and smoke through the opening.

TRIM
The finishing materials around the edges of a door or window, such as casing or molding. In fire-rated doors, trim must be non-combustible and installed in a way that does not compromise the door's fire resistance.

T-SHAPED ASTRAGAL
A type of astragal used in double doors, featuring a T-shaped profile that seals the gap between the doors when closed. T-shaped astragals in fire-rated doors are often equipped with intumescent seals to enhance the fire barrier.

U-VALUE
A measure of the thermal conductivity of a material, indicating how well it insulates against heat transfer. In fire-rated doors, a low U-value is desirable to prevent heat from passing through the door and contributing to fire spread.

UNDERCUT
The space between the bottom of a door and the floor. In fire-rated doors, undercuts must be minimized and sealed with fire-resistant materials to prevent the spread of fire and smoke.

UL LISTING
A certification provided by Underwriters Laboratories (UL) indicating that a product, such as a fire door, has been tested and meets specific safety standards.

UNEVEN FLOOR CLOSER
A door closer designed to accommodate doors that must operate on uneven floors. These closers are adjustable and ensure that fire doors close securely and maintain the fire barrier, even on sloped or irregular surfaces.

VERMICULITE
A naturally occurring mineral used in the construction of fire-resistant cores for doors. Vermiculite is lightweight, fire-resistant, and provides excellent thermal insulation, making it an ideal material for use in fire-rated doors and other passive fire protection systems.

VISION PANEL
A window installed within a door to allow visibility through the door. In fire-rated doors, vision panels must be made from fire-resistant glass and installed with appropriate seals to maintain the door's fire-resistance rating.

VENTILATION GRILLE
A grille installed in a door to allow air circulation. In fire-rated doors, ventilation grilles must be equipped with intumescent seals that close off the grille in the event of a fire, preventing the passage of flames and smoke.

WARRANTY
A guarantee provided by manufacturers like Australian Architectural Fire Doors Pty Ltd, ensuring that fire doors will perform as required under specified conditions. Warranties typically cover defects in materials and workmanship and ensure that the fire doors meet the required fire-resistance ratings.

WEATHERSTRIP
A material placed around the edges of doors and windows to prevent air, water, and debris from entering. In fire-rated doors, weatherstrips are also designed to prevent the spread of fire and smoke, often incorporating intumescent materials that expand when exposed to heat.

WIND LOAD
The force exerted by wind on a structure, including doors and windows. Fire-rated doors must be designed to withstand wind loads without compromising their fire resistance, particularly in high-rise buildings or areas prone to strong winds.

WOOD STAVE CORE
A type of core used in fire-rated doors, made from small pieces of wood bonded together to form a solid, fire-resistant core. Wood stave cores provide structural integrity and help prevent the door from warping under fire conditions.

WRAP-AROUND HINGE
A hinge that wraps around the edge of a door, providing additional support and strength. In fire-rated doors, wrap-around hinges are used to ensure that the door remains securely attached to the frame during a fire.

X-RAY DOORS
Specialized doors designed to block X-rays, often used in medical facilities. X-ray doors with fire ratings incorporate lead or other dense materials to block radiation while also providing a fire-resistant barrier, ensuring safety in both fire and radiation exposure scenarios.

XPANDER SEAL
A proprietary type of intumescent seal that expands when exposed to heat, sealing gaps around fire doors to prevent the spread of fire and smoke. Xpander seals are commonly used in high-performance fire door assemblies.