Glossary of Terms

This glossary details a wide range of passive fire protection related terms and definitions.

The terms below are courtesy of ASDMA The Architectural and Specialist Door Manufacturers Association

For the purpose of this document the following definitions apply:

NOTE: Where noted, definitions are culled from BS EN 12519:2004, various parts of BS6100 and BS8214 2008

Active leaf

Leaf of a multi-leafed door set or door assembly intended to move first to provide opening. Otherwise referred to as the primary leaf. See: BS EN 12519 : 2004

Ad hoc assessment

As assessment specifically written for a particular set of circumstances or construction project. See Project Assessment.

Aperture

An opening created by a cut-out through a door leaf that is to receive glazing or other infilling. See vision panel.

Approving authority

Term used to describe the building control or fire authority.

Architrave

Trim item used to cover installation gaps between the frame and the surrounding structure. See BS EN 12519:2004

Arris

The point at which two planes meet - usually a right angle in connection with doors.

Assessment

Application of expert knowledge to data established by a series of fire tests of a door leaf construction or particular design type to extend the scope of the results. See: Envelope / Extended application (1) / Global Assessment / ‘Ad Hoc’ Assessment / Project Assessment.

Astragal

A component usually metal or timber applied at the meeting edges and used in lieu of rebates. Otherwise referred to as a clashing strip.

Attestation

The conferring of approval in relation to a product performance usually in connection with satisfying the essential requirements of the Construction Products Regulations.

Audit test

A term used to describe a routine re-testing usually performed as a requirement of third party certification schemes at standard intervals e.g. 5 - yearly.

Automatic release device

Hardware component that, upon receipt of a command signal, causes the release of hold open devices so allowing the door to return to the fully closed position under control of an automatic self-closing device.

Automatic self-closing device

Hardware component which provides for a door to return to the fully closed position without human intervention after it has been opened.

Back check

A function of an automatic door closer that limits the opening movement of the door.

Bead

See glazing bead.

Binding

The action of a door leaf jamming at points around its periphery where there is insufficient margin.

Bolection bead

Glazing bead that is rebated to provide for an overhang over the face of the door leaf to provide cover around the edge of an aperture. Otherwise referred to as a cloak bead. See BS 6100-4.4:1992 bolection moulding.

Chamfer

A slope from the horizontal or vertical. See splay.

Cill

See frame sill.

Clashing strip

See astragal.

Classification

A performance level assigned to a product following test to a European Standard.

Clear opening dimension

The clear opening width is the dimension from the face of the door stop on one jamb to the corresponding position at the opposite jamb. The clear opening height is the dimension from the bottom of the head door stop to the top of the finished floor level (or top of threshold – if used). See: BS EN 12519 : 2004 NOTE: For BS8300 - Provision for the Disabled - The clear opening width is defined as above for doors that open more than 90O. For doors that are restricted to open to 90O the clear opening width is further defined as above less half the thickness of the door leaf, less the dimension of the projection of any hardware into the traffic space. See also: ASDMA publication Guidance for the coordination of bespoke door sets.

Clear glass opening (cgo)

The area of a glazed aperture after the glazing beads have been fitted.

Cloak type bead

See bolection bead.

Closing face

The face of a single action door that contacts the door stop when the door is closed. See: BS EN 12519 : 2004

Configuration

The particular composition and method of operation of a door usually involving a combination of the following options:


  • Swing - single or double

  • Number of leaves - single, double or more

  • Latching - whether latched shut for use or unlatched (with closer)

  • Meeting edge arrangement - square, rebated or rounded.

  • Door or storey height

  • Transom / over panel or fanlight / flush over panel (without transom)

  • Edge detail - square, rebated, rounded

  • Glazed or unglazed

  • Hardware

Constructional faces

Layers of a material eg timber applied to the opening and/or closing surfaces of the door that restrain movement in the core and contribute to the performance of the door.

Contract definition schedules

Contract documentation usually produced by the fire door provider or other specialist that describes the detailed specification and location of all doors usually on a named project basis.

Coordinating dimensions

Theoretical design dimensions used for the coordination of building elements including nominal opening height and width dimensions of openings to receive door sets or door assemblies. See: BS EN 12519 : 2004 - See also: ASDMA publication Guidance for the coordination of bespoke door sets.

Coordinating height (transoms & overpanels)

The dimension from the bottom of the frame jamb to the top of a transom rail, measured at the door leaf position OR the dimension from the bottom of the frame jamb to the under side of an over panel measured relative to the opening face of the door leaf, at the time of manufacture. See ASDMA publication Guidance for the coordination of bespoke door sets.
NOTE: Relevant to storey height assemblies only.

Cover fillet

Fillet to cover a joint in joinery or between joinery and the adjoining work. See quadrant BS6100-4.4.

Datum

Fixed position in height above the nominal floor level that may be used as a reference by a door set manufacturer (and other trades) for the determination of door set dimensions and door set component location dimensions to ensure alignment of components with adjacent door sets. See also: ASDMA publication Guidance for the coordination of bespoke door sets.

Direct application, (field of)

Variations to the specification of the tested specimen that are permitted by reference to BS EN 1634-1.

Door assembly

Complete assembly as installed, including door frame and one or more leaves, together with its essential hardware supplied from separate sources. See: BS EN 12519 : 2004.

Door bottom rail

The bottom edge of a door leaf See: BS EN 12519 : 2004

Door frame (1)

Part of the door assembly from which the door(s) hang. See: BS EN 12519 : 2004 & BS6100-1.3.5

Door frame (2)

Fixed surround into which are fitted one or more door leaves.
NOTE: The door frame can also be designed to surround other panels and can include, sill threshold, architrave or other cover moulds. The door frame can be a separate item to be fixed to the adjacent structure, or it can be an integral part of a wall or partition. See: BS8214 : 2008.

Door growth

The extent of the movement in the horizontal plane that a door requires to clear a frame jamb (or adjacent leaf if a double leaf door set) during operation. This is a variable related to the door leaf width, door leaf thickness and the location of the pivot centre around which the door swings. Related to Operating gaps. See: ASDMA publication Guidance for the coordination of bespoke door sets.

Door head

The top edge of a door leaf See: BS EN 12519 : 2004

Door height door set

A door set or door assembly without an over panel or fanlight.

Door leaf

Hinged, pivoted or sliding part of a door assembly or door set. See: BS EN 12519 : 2004 & BS6100-1.3.5

Door leaf construction

A specific combination of inner core with or without internal framing with its sub-facings, facings and lippings.

Door leaf height

The overall height of a door leaf at the time of manufacture. See: BS EN 12519 : 2004

Door leaf width

The overall width of a door leaf at the time of manufacture. See: BS EN 12519 : 2004

Door leaf thickness

The thickness of a door leaf, at the frame rebate position, excluding any beading or planted decoration at the time of manufacture.

Door set

Complete unit consisting of a door frame and a leaf or leaves, supplied with all essential parts from a single source. See: BS EN 12519 : 2004 & BS6100-1.3.5

Door set - factory assembled

Door(s) and frame(s) factory assembled and factory fitted with non-projecting hardware.
NOTE: doors may be removed from frames for the purpose of transportation.

Door set - kit

A door set kit consists of at least two separate components that need to be incorporated in the construction works that is placed on the market ( i.e. made available for sale) by a single manufacturer.

Door set - knock down

Frames are supplied separately with frame jambs / heads & transom rails cut to size and factory jointed for site assembly. Frames are not prepared to receive hardware. Loose doorstop and architrave supplied over length to be cut to size and jointed on site. Door leaves are supplied separately and may be edge machined only (where specified) for non-projecting hardware.

Door set - door set kit

Doors and frames supplied as described for knock down but delivered at the same time and packed into location kits that may include specified items of hardware. See also: door kit – BS8214 : 2008.

Door stile

The vertical edges of a door leaf. See: BS EN 12519 : 2004 & BS6100-4.4

Door stop (1)

An element of a door frame that limits the swing of a single action door leaf. See: BS EN 12519 : 2004 BS6100-1.3.5 & 4.4

Door stop (2)

An item of hardware usually floor or wall mounted that is positioned to arrest the opening movement of the door leaf.

Double action door

Hinged or pivoted door that can be opened in either direction. See: BS EN 12519 : 2004

Double leaf door set

Otherwise referred to as a pair of doors where two door leaves are used in a single plane with each leaf attached to a different jamb. See: BS EN 12519 : 2004 & BS6100-1.3.5 (Conflicting definitions)

Double door door set

Otherwise referred to as back to back door sets where two doors are hung from a single frame with coordinating width dimensions suitable for a single leaf door set. See: BS EN 12519 : 2004

Durability

The ability of a product to provide for its design performance for the period of its intended life.

Envelope (applications envelope)

The limit of door leaf sizes permitted within an assessment. See: Extended application (1) / Global Assessment / ‘Ad Hoc’ Assessment / Project Assessment.

Equal pair

A double leaf door set where each leaf is of equal width.

Essential (builders) hardware

Items of hardware that must be used to maintain a specified performance. See: hardware. See also BS8214 : 2008 Annex A

Exaps

See extended application (field of) (2)

Extended application (field of) (1)

An in depth review of the particular product design and its performance in tests by a recognised authority that will produce a report describing approved variations. See: Envelope / Global Assessment / ‘Ad Hoc’ Assessment / Project Assessment.

Extended application (field of) (2)

Approved variations to a product tested to the requirements of BS EN 1634-1 by the application of rules applied by a notified body with reference to BS EN 15269-2 for CE marking purposes.

Extension lining

A frame component added to the frame lining to extend the dimensions of the frame partition thickness to suit a specified structural reveal dimension. See: ASDMA publication Guidance for the coordination of bespoke door sets.

External door

A door leaf that is directly exposed to external environmental conditions on one or both sides of the door leaf. See: BS EN 12519 : 2004 & BS6100-1.3.5

Fanlight

The space between a frame transom rail and the frame head that is generally glazed. See: BS EN 12519 : 2004 & BS6100 1-3.5 & BS6100-1.3.5

Finished floor level

The level above or below the nominal floor level resulting from the application of finishes and / or other building design considerations related to finished floor levels. Floor finishes may include carpet, vinyl or ceramic tiles, wood or laminate flooring etc. See ASDMA publication Guidance for the coordination of bespoke door sets.

Fire door (1)

General term used to describe a complete installed door assembly comprising door frame, door leaves, other panels, hardware, seals and any glazing that, when closed, is intended to resist the passage of fire and smoke in accordance with specified performance criteria.

Fire door (2)

Door provided for the passage of persons, air or objects which, together with its frame and furniture as installed in a building, is intended (when closed) to restrict the passage of fire and/or gaseous products of combustion, and is capable of meeting specified performance criteria to those ends.
NOTE: A fire door may have one or more leaves, and the term includes a cover or other form of protection to an opening in a fire-resisting wall or floor or in a structure surrounding a protected shaft. See: BS8214 : 2008.

Fire door assembly

Door assembly, intended, when closed, to restrict the passage of fire and/or gaseous products of combustion and to be capable of meeting specific performance criteria to those ends. See: BS8214:2008

Fire resistance

Ability of a component or construction of a building to meet for a stated period of time some or all of the appropriate criteria specified in BS476 Pt.22 or BS EN 1634.
NOTE: These criteria can include stability and/or integrity and/or thermal insulation. See: BS8214:2008.

Fire test study group (ftsg)

Informal grouping of fire test laboratories in the United Kingdom, originally formed to agree common interpretations to details of test procedures.

Fire stopping

The filling of joints between the door frame and the supporting construction with material/s that will prevent the passage of fire through the joints.

First-fix

Installation of doors or door frames as the erection of the supporting constructions proceeds.

Flush bead

Glazing bead that does not project beyond the face of the door leaf.

Fitting-in margin

The space between the periphery of a door frame and the inside of a prepared opening. See ASDMA publication Guidance for the coordination of bespoke door sets.

Flush door (leaf)

A fabricated door leaf that is flush on both faces of the door leaf. See: BS EN 12519 : 2004 & BS 6100-1.3.5

Flush over panel

A panel located between a door leaf and a frame head to provide for storey height door sets when used without a transom rail.

Frame jamb

see jamb.

Frame lining

The primary frame jamb and head components of a door frame that form the outer perimeter of a door set or door assembly before the addition of architrave extension linings etc.

Frame mullion

A vertical section of a door frame that is located between the frame jambs. See: BS EN 12519 : 2004 & BS6100-1.3.5

Frame nominal opening width / height

The dimensions between the faces of a frame at the frame reveal (at the door leaf position) in width and from the bottom of the frame jambs or top of a sill to the frame reveal (at the door leaf position) at the frame head or transom rail. See: shoulder dimensions. See also: BS EN 12519 : 2004 & ASDMA publication Guidance for the coordination of bespoke door sets.

Frame nose dimension

The visible part of a frame in elevation when viewed from the opening face of a door set or door assembly when the door is in the closed position before the addition of architrave. See: ASDMA publication Guidance for the coordination of bespoke door sets.

Frame partition thickness

The overall dimension of the frame, including extension linings but excluding architrave. May be different to the wall partition thickness. See: ASDMA publication Guidance for the coordination of bespoke door sets.

Frame rebate

The section formed in a frame to create a housing to receive a single action door leaf. See: BS6100-4.4

Frame reveal

The dimension from the nose of the frame to the face of the doorstop. This is related to the door leaf thickness and may vary for any given door thickness to accommodate sealing systems or the extent to which the door leaf is to be set back from the face of the frame. The internal side surfaces of a door frame at the door leaf position. See: BS6100-1.3.5

Frame sill (cill)

A frame component that is jointed to the frame jambs at the bottom of a door set or door assembly. See: BS EN 12519 : 2004 & BS6100-1.3.5

Frame transom

A horizontal frame section that is jointed to the frame jambs at a position between the door leaf and the frame head to provide for extended height door sets / door assemblies. See: BS EN 12519 : 2004 & BS6100-1.3.5 & 4.4

Frame width / height

The overall width of a frame excluding architrave in width. The overall dimension from the bottom of the frame jambs (or bottom of a sill if used) to the top of the frame head excluding architrave. See: BS EN 12519 : 2004

Glazing bead

Door components used to secure glass in a door leaf or frame. See: BS EN 12519 : 2004

Glazing channel

A ‘U’ section component of a glazing system in any material into which glass is positioned prior to being fixed within an aperture.

Glazing system

Complete system including linings, gaskets, seals beading and bead fixings (i.e. pins or screws) required to secure glass in a door leaf or door frame.

Global assessment

Comprehensive approval report provided by an expert authority that describes a field of extended application related to a specific door leaf construction. See: Envelope / Field of Application.

Hardware

Door set / door assembly components usually in metal that are fitted to a door or frame to provide for the operation and securing of a door leaf.

Harmonised european standard (hen)

Documentation that identifies product characteristics, performance requirements, test methods, classification and conformity attestation throughout the European Community.

Inactive leaf

Leaf of a multi-leafed door set or door assembly, intended to be moved in sequence after the active leaf. Otherwise referred to as the secondary leaf or passive leaf. See: BS EN 12519 : 2004

Installation gaps

The spaces required between a door frame and a surrounding structure to provide for the installation of second fix door sets. See ASDMA publication Guidance for the coordination of bespoke door sets.

Internal door

a door leaf located between two internal spaces. See: BS EN 12519 : 2004 & BS6100-1.3.5

Intumescent seal

Seal used to impede the flow of heat, flame or gases, which only becomes active when subjected to elevated temperature.
NOTE: Intumescent seals are components which expand, helping to fill gaps and voids, when subjected to heat in excess of ambient temperatures. See: BS8214 : 2008.

Insulating glass (fire)

Glass that insulates the unexposed face from heat applied on the exposed face.
WARNING: Insulating glass intended to provide for Building Regulations (England & Wales) Approved document ‘L’ related thermal insulation performances may not be suitable for fire door applications.

Insulation (fire)

The ability of a construction to restrict the transfer of heat from the fire-exposed face to the protected face within set parameters.

Integral door stop

A door stop created by rebating the door frame. See: moulded door stop.

Integrity

The period during which a fire door prevents the passage of fire through the door set

Intumescent material

Material which is inert in a cold state but under heating expands volumetrically and is designed to seal gaps within a construction and delay penetration by smoke, flames and hot gas.

Ironmongery

See hardware.

Jamb

Vertical side of a frame. See BS EN 12519:2004 & BS6100-1.3.5

Joinery door

A door leaf constructed of solid timber components that are jointed together.

Laminate

High pressure decorative laminated plastic.

Latch

Self engaging fastener which secures a moveable component (e.g. door) in a closed position and which can be released by hand. See: BS8214:2008 & BS EN 12209.

Latched door

A door in which a latch fitted to the door leaf has been activated to hold the door leaf in the closed position when shut.

Leading edge

The bevelling of the closing stile of the door leaf to accommodate ‘door growth’ in operation. See: ASDMA publication Guidance for the coordination of bespoke door sets.
NOTE: The leading edge is generally applied by the installation contractor to suit the requirements for each location. However, some manufacturers offer a factory applied ‘leading edge’ facility as an optional extra.

Left hand door

Door which opens with a rotating movement with the hinge position on the left hand side when viewed from the opening face. When viewed on plan the door will move in a clockwise direction. See: BS EN 12519 : 2004
WARNING: Some hardware items use a different method of handing.

Lips and lippings

Trim usually of hardwood or plastic applied to the edges of a door leaf.

Lock

Fastener which secures a moveable component in a closed position within an opening and which is operated by a key or other device. See:BS8214:2008 & BS EN 12209.

Meeting edges

Edges between double leaf doors or between a door leaf and flush over panel.

Mortice or mortise

A slot or cavity formed to receive an item of hardware or as part of a joint between two pieces of joinery.

Mould (verb)

The process of machining lengths of timber to a profile.

Moulded door stop

A door stop that is machined from a single piece of timber and which is an integral part of that frame jamb, head or transom. (Suitable for use with door leaves of a known or fixed thickness). See: door stop (1). See also: BS6100-1.3.5.

Non essential (building) hardware

Items of hardware that are not necessary for the purpose of maintaining a specified performance. See: hardware. See also:BS8214 : 2008 Annex A

Nominal floor level

A coordinating level used for determining a prepared opening height and the level for applied floor finishes. See: BS EN 12519 : 2004 See also: ASDMA publication Guidance for the coordination of bespoke door sets.

Non-insulating glass

Glass that does not insulate the unexposed face from heat applied on the exposed face.

Non projecting hardware

Items of hardware that can be fitted within the thickness of the door leaf without projecting beyond the face of the door.
NOTE: Butt hinges are generally considered as being non projecting items of hardware.

Notified bodies

Bodies notified to the European Commission by Member States as being capable of performing certification, production surveillance and initial type testing.

Operating gaps

The space between the edges of a door leaf and the door frame, floor, threshold or opposing leaf or over panel that is necessary to enable the door leaf to be opened and closed without binding. See ASDMA publication Guidance for the coordination of bespoke door sets.

Over panel

A panel, usually constructed to the same details as a door leaf to fill a space above a door leaf when used with storey height door sets or door assemblies. The door leaf and over panel may be separated by a transom rail. Where no transom rail is fitted the over panel is termed ‘flush over panel’. See flush over panel. See also: ASDMA publication Guidance for the coordination of bespoke door sets.

Packing (installation)

Material used to fill the fitting-in margin at the door frame fixing points and the act of installing it.

Panelled door / glazed door leaf

A flush door that is cut to form glazing apertures or to receive panels OR a joinery door fabricated to form glazing apertures or a space to receive panels. See: BS EN 12519 : 2004 & BS6100-1.3.5

Performance door sets

The primary function of a door set is to provide a facility for ‘traffic’ to pass from one side of a wall to another. The term ‘Performance door set’ is used where a secondary performance is required. Secondary performances may include: fire, smoke sealing, sound aattenuation, air permeability, weather sealing, etc.

Planted door stop

A door stop that is added as a separate component to the frame jamb, head and / or transom (suitable for use with door leaves of an unknown or variable thickness). See door stop (1) See also: BS6100-4.4

Precision projects

Building projects where structural and design considerations require a high level of accuracy and precise dimensions for the purpose of manufacturing door set components. All details necessary to determine precise dimensions must be known to the door set / assembly manufacturer in advance of the commencement of manufacture. See: ASDMA publication Guidance for the coordination of bespoke door sets.

Prepared opening

The opening (height, width and thickness) in a building that is prepared by the builder to receive door sets / door assemblies of the designed details and dimensions. The prepared opening dimensions may be the same as the structural opening dimensions or related to the coordinating dimensions by reference to BS EN 12519 : 2004 according to the nature of the design of the structure. See: ASDMA publication Guidance for the coordination of bespoke door sets.

Primary leaf

see active leaf.

Primary test evidence

Evidence of the performance of a fire door that is derived from a full scale fire test on that particular product design by the test sponsor.

Product standard

A single document citing all the performance characteristics recognised or required in any member States of the EC and describing:


  • A reference to all of these characteristics

  • The test methods to be used to evaluate the characteristics

  • The classes (classifications) of the characteristics that are required

  • The system by which the conformity of the product to the classification is attested

Project assessment

Comprehensive approval report provided by an expert authority that describes a field of extended application for a specific door set design when related to identified locations in a particular building and where these details are known in advance of the assessment. See: ‘Ad Hoc’ assessment.

Quadrant

A trim item usually used in conjunction with architraves to cover installation tolerances at a junction between components. See cover fillet

Rack (verb)

The levering action applied to hinges and pivots when the opening movement of the door leaf is arrested by contact of the door leaf with a vertical projection such as the door frame or masonry reveal.

Rebate

A step formed in a door frame or the meeting edges of door leaves / flush over panels which arrests the movement of the door leaf at the closed position. See BS6100-4.4.

Rebate depth (frame)

See frame reveal

Recess

A cut-out formed in a door leaf or door frame to allow an item of hardware to be fitted usually flush with the surface.

Right hand door

Door which opens with a rotating movement with the hinge position on the right hand side when viewed from the opening face. When viewed on plan the door will move in an anti-clockwise direction. See: BS EN 12519 : 2004
WARNING: Some hardware items use a different method of handing.

Screen

See side screen

Seal

Fitting provided to close a gap for the purpose of controlling the passage of air, smoke, water, fire , sound, etc. See: BS8214 : 2008.

Second fix

Installation of a door set into openings in a supporting construction formed to receive them. See: Prepared Opening.

Secondary leaf

See inactive leaf

Sequential opening

A term used in connection with double leaf door sets to identify a requirement that door leaves should be operated in sequence. See active leaf.

Shooting

A trade term to describe the internal dimensions of a door frame at the door leaf and or panel positions at the time of manufacture.
NOTE: This is the same as the Frame Nominal opening for width. For height; the shoulder height is the dimension from the bottom of the jambs (or top of the sill) to the underside of the frame head at the door position for door height door sets. A second shoulder height is defined for storey height door sets from the bottom of the jambs (or top of a sill) to the underside of a transom at the door leaf position. See: ASDMA publication Guidance for the coordination of bespoke door sets.

Side panel

A lateral opaque extension of a door that may be a separate component using separate jambs or form part of a door frame using mullions.

Side screen

A lateral extension of a door glazed to provide light or vision that may be a separate component using separate jambs or form part of a door frame using mullions.

Simultaneous opening

A term used in connection with double leaf door sets to describe a requirement where the door leaves may be operated in any sequence or at the same time.

Single action door

Hinged or pivoted door that can be opened in one direction only. See: BS EN 12519 : 2004

Sill

See frame sill

Smoke seal

Seal fitted to the leaf edge or frame reveal for the purpose of restricting the flow of smoke or hot gases. See: BS8214 : 2008 & BS EN 1634-1.

Smoke stopping

The filling of joints between the door frame and supporting construction with material/s that will prevent the passage of smoke or gaseous products of combustion through the joints.

Splay

Large chamfer forming a considerable bevelled surface. See: BS6100-4.4 : 1992.

Splay / splayed (door edges)

A bevel, usually 2-3O° applied to the edge of a door leaf to assist in providing an operating gap that will allow it to pass the edge of an opposing door leaf or door frame during operation of the door leaf. See: leading edge. See also: ASDMA publication Guidance for the coordination of bespoke door sets.

Square bead

Glazing bead that is rectangular in section.

Storey height door set

A door set or door assembly that is of extended height generally to fill a full floor to ceiling space and that may be constructed using flush or transomed over panels or fanlights.

Structural opening

The opening formed in a wall or partition to receive another construction product e.g. a door set. A structural opening may need to be further adjusted to form a prepared opening. See: prepared opening. See also: ASDMA publication Guidance for the coordination of bespoke door sets.

Structural reveal

Side surfaces of an opening in a wall. See BS EN 12519 : 2004.

Stud

Components of wood or metal that, when assembled together form a framework to which board facings are fixed to form a stud partition.

Sub frame

A frame supplementary to the main door frame that is used to line a structural opening as a preliminary to the installation of the door set. This may take the form of a template to which the supporting construction is built or may be installed by the builder for the purpose of creating a prepared opening to the required dimensions. See: prepared opening. See also: ASDMA publication Guidance for the coordination of bespoke door sets.

Supporting construction / structure

The wall or partition into which the door set is fixed.

Swing

The opening movement of a door leaf; either single swing opening in one direction or double swing opening in both directions. See: BS EN 12519 : 2004

Tested design (fire)

A specific combination of materials and components which has been exposed to a fire resistance test and achieved a stated performance.

Threshold gap

The space at the bottom of a door set or door assembly under the door leaf when the door is in the closed position. See: BS EN 12519 : 2004

Threshold strip

A component that is not part of the door frame which is located under the door leaf when the door is in the closed position. A threshold strip may be in any material and may be profiled and/or rebated to form a door stop. See: BS6100-1.3.5 : 1999.

Traffic

A single word term to describe the users of a doorway including persons, equipment and other objects.

Transitional period

The time following the availability of an hEN during which member States permit the use of products that comply with existing national standards prior to the withdrawal of national standards.

Transom (transom rail)

Horizontal member dividing an opening or frame of a window or a door set. See: BS EN 12519 : 2004 & BS6100-1.3.5 : 1999.
NOTE: for door set applications the transom is generally positioned to correspond with the top edge (head) of the door leaf to act as a door frame head below a glazed or solid infill panel. See: ASDMA publication Guidance for the coordination of bespoke door sets.

Transomed over panel

An opaque panel construction used above a door leaf in the space created between a transom rail and a frame head in a storey height door set. See: ASDMA publication Guidance for the coordination of bespoke door sets.

Ukas

United Kingdom Accreditation Service - organisation responsible for monitoring the capabilities of the testing laboratories.

Unequal pair

A double leaf door set where one of the leaves (usually the active leaf) is wider than the other leaf. See: active leaf See also:ASDMA publication Guidance for the coordination of bespoke door sets.

Vision panel

A panel of transparent or translucent material fitted into a door leaf to provide a degree of visibility from one side of a door leaf to the other. See: aperture.

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