Glossary of Technical Terms

24DC MotorA 24 volt direct current motor used for door automation. Mains supply is 240v.
Access Control DeviceA device linked into the door or gate operator to enable the appropriate door activation. Various options are available
Automated OperatorA motorised operator (opener) that controls the opening and closing of a door via the use of radio frequency handsets or alternative means.
Backroom (backspace)The horizontal clearance distance backwards from the inside face of the lintel (or opening) to the nearest obstruction. Sufficient backroom is required to allow for the physical door components in the open close or operational positions.
Behind-fixA type of installation where the door is fitted to the inside face of an opening and overlaps the nibs and lintel.
Between fixA type of installation where the door is fitted within the opening.
Bi-FoldThe term bi-fold or bi-folding door should not be used when specifying an 3rd Generation Doors Fold-Up Door.
Bottom RailAn extruded or solid horizontal length attached to the bottom of the door to provide strength and reinforcement of the door.
BulkheadIn architecture a bulkhead is referred to as an enclosed boxed area or downstand from a ceiling (typically used in retail applications). Where a bulkhead is used to enclose a door’s roller drum it is important that allowances are made for fitting and servicing the door.
Bushfire Zone Fire RatingThe NCC specifies the level of fire rating applicable for Buildings and buiding components (including doors) within Bushfire zones.
Cable DrumsGrooved drums fitted onto each end of the steel cross shaft. Lifting cables wind around the grooves of the cable drum to enable the door to open or close without cable lapping or chafing.
Chain OperationOperation of a door by mechanical hauling chain. See also Emergency Hand Chain
CladdingBuilding material fitted to the door frame for the purpose of appearance style and function.
Counterweight balanceA means of balancing the door by using steel counterweights that are held in constant suspension by pulleys and steel wire ropes.
D.L.I. GateOutdated term. See Personal Exit Door
Dead Man SwitchIn electrical terms a switch that must be held in or latched for current to flow. Once released current stops. ‘Dead Man’ switches are used for line of sight closing of doors as a safety precaution.
Door CurtainThe main part or body of a rolling door.
Door GuideA channel section which guides the door’s edge as the door opens and closes.
Door TrackA channel section which guides the door’s track rollers (which are fitted to the edge of a door) so that the door operates smoothly.
Drive Through HeightAlso referred to as drive through clearance ‘walk through height’ ‘max’ headroom’ ‘head clearance’ ‘max clearance’ ‘clear opening height’). This height is the actual resultant height under the door when in the open position. It is measured at mid span and at the lowest point. It is the opening height minus ‘T’ (total door thickness plus working clearance when door is in open position) and estimated deflection. Furthermore the floor may slope up or down. Therefore the minimum required drive through height should always be specified by the door user.
DrumTypically a cylindrical pipe over which the (rolling door) curtain rolls.
Drum AxleIn rolling doors the fixed central hollow pipe or solid steel shaft that the drum rotates around.
Drum Support BracketsBrackets fixed to the wall above the door way that support the (rolling) door’s drum
Ear LugWelded at each side of the counterweight door are ear or pivot lugs that the link arms connect to. Their position is defined and important to the door operation. Also referred to as a ‘Door Lug’.
Electrically operatedA method of operation whereby an electrically driven door operator is used to open and close the door.
Emergency Hand ChainEnables emergency chain operation of motorised doors if there is a power outage. NOTE: It may not be possible to open very large doors using a chain.
Emergency Key ReleaseA release mechanism (by key) which disengages the door operator from the outside to allow manual operation. Recommended in applications that do not have any other access point into the garage or building.
Emergency Release MechanismA feature of a door operator that allows manual operation by hand or chain.
External ProjectionThe maximum distance that the door protrudes out from the fixing face in the open position.
FasciaA horizontal panel or board fitted into the top of the opening. Required in applications where there is insufficient headroom.
Fire Rated Roller ShutterA doorset which is classified and certified to withstand a fire as defined in Australian Standards AS1905.2 – 2005.
FittingsThis term covers all the ancillary parts that are ‘fitted’ to the door stiles inclusive of all hardware.
Fixing FaceThe internal vertical face or wall surface that the tracks are fitted against. This locates the face of the door in relation to the walls.
FlashingA strip of impervious material (typically Colorbond sheet metal) used to trim and/or seal the edges of door or fascia cladding.
Fold-Up DoorA proprietary counterweight door system as defined and described elsewhere in this Catalogue.NOTE:Other loose terms in the industry for this type of product may include Bi-fold Counterweight Door Renlita Door Series 3000 or Foldaway Sectional Door.
Frequency of useMeasured on cycles per hour. Doors are rated; ‘Intermittent’ ‘Moderate’ or ‘High’. A standard doorset is rated ‘Intermittent’. A door specifically designed for ‘High’ usage can be designed to operate up to 20 cycles per hour.
Fusible linkA thermo-electric fuse that breaks apart when electrically charged. It is used to trigger the descent of a fire shutter.
GlazingThe act of setting with glass.
Hand operationOperation of a door by pushing or pulling by hand.
Head PlateA flat steel plate welded on top of the track that carries the pulleys. Sometimes also called ‘Header’ or ‘Heading Plate’.
HeadroomThe unobstructed vertical distance above the lintel.
Helical torsion springsA cylindrical coil of tempered spring wire used for counterbalancing by torsion.
High usageSee Frequency of use.
Inside Looking OutUnless otherwise stated drawings are (as standard) drawn from the inside of an opening looking out.
InterfaceThe act of sending or receiving ancillary signals to or from the door controller. Interfacing is used for Access Control Fire Service Signals and Security Monitoring.
Internal ProjectionThe maximum distance that the door protrudes in from the fixing face in the open position.
Isolating SwitchA switch which isolates the mains power supply and is a mandatory safety requirement.
JambA vertical section (typically of steel RHS) that forms the side of a door opening to create sideroom packing or adequate fixing points.
Key Release(See Emergency Key Release)
kPaA SI unit of pressure = Kilopascals. 1 kPa = 1 kN per square metre. (1 kN = 1000 Newton’s or 101.972 kg )
Leaf (Door Leaf)A term used to refer to the body or panel of a counterweight or sliding door/gate
Lift-UpIn counterweighted doors this term often refers to a Glide-Up door which is described elsewhere in this Catalogue
Link ArmIn counterweight doors the link arms control the articulation of the door. They are typically steel flat sections pivoted at the top of each door track (at the post lug) and connected to the door at the ear lug. Also referred to as a ‘Pivot Arm’.
LintelA horizontal structural member which supports the load over a door opening.
Loop DetectorIn Automation a large loop of wire is embedded in the ground. When a large metal object i.e. a car passes over it a slight current is induced in the wire which signals the door access control. It is used as a means of automated exit control.
LSDLSD is Limit State Design which is the applicable design method for all steel structures in Accordance with AS 4100 2000. ULS and SLS are respectively the Ultimate Limit State and Serviceability Limit State design Wind Loads applicable.
Manual operationOperation of a door either by hand or chain (without electrical operation).
Master KeyingThe coordination of cylinder locks to be opened or locked by one “master” key. The hardware supplier is responsible for the lock cylinder and our locking device needs to be coordinated with the hardware supplier. The lock cylinder may be furnished by this supplier and changed on site.
MullionAn aluminium steel or timber vertical section with door guides on each side to enable operation of doors.
Opening heightThe measured vertical distance from the ground (floor) to the bottom of the lintel. NOTE: The opening height is not necessarily the final drive through clearance height. The door may rest under the lintel (as is the case with some counterweight doors).
Opening WidthThe measured horizontal distance between the door nibs columns or jambs forming the opening.
Pad-boltA sliding bolt (with provision for a padlock) to fasten a door. See also Shoot-bolt.
Personal Access (PA) DoorsA small door built within the main door. Only recommended where there is no other access into the garage or building. NOTE: Personal Entry Doors open inward and Personal Exit Doors open outward.
Personal Entry DoorSee Personal Access Doors
Personal Exit DoorSee Personal Access Doors
Planetary GearingA gear train used to increase the speed and provide mechanical advantage used in chain operated Roller Doors.
PLC (Programmable Logic Controller)A sophisticated programmable door controller allowing multiple input and output functions parameter control and diagnostic analysis. Typically used in CFA Emergency Service or High Rise applications.
Post LugWelded at the top of each track (in counterweight doors) is a steel flat section that the link arm bolts to and pivots from. Its position is defined and important to the door operation. Also referred to as a ‘Top Pivot’ or ‘Guide Lug’.
PostsPosts are typically RHS or SHS sections concreted into the ground to form a door opening. Sizes vary based on load and height.
PulleyIn counterweighted doors and low headroom rear torsion sectional doors a pulley is a machined steel cast steel or plastic sheave grooved to take a steel wire rope. It is typically ball bearing loaded fitted in a yoke or saddle and comes in a range of diameters.
Pulley HeadroomIn counterweighted doors the pulley sheaves sit on top of the head plate which is welded level at the top of each track.Therefore the pulleys are higher than the door and require corresponding head room. As the counterweights hang next to the tracks the ‘footprint’ of the track and counterweight assembly (in plan view) correspond then to the area where this head room is required.
Pulley LayoutIn counterweight doors the spatial layout in plan view of the pulleys track and counterweight. It corresponds to the footprint of the complete track/counterweight assembly which is enclosed by the counterweight cover or surround.
Push Button StationA push button station typically includes UP DOWN (or OPEN CLOSE ) and STOP function control. It can also include a keyed isolating switch as an option.
Push Pull RodA steel rod to assist with manual opening or closing of doors.
Receiver or Receiver CardIn automation the electronic circuit card that receives the radio signal from the hand transmitter or access control signal.
Remote Control/AutomationThe term ‘remote control’ has come specifically to mean radio frequency control of doors however it simply means access control of a door remotely or at a distance.
Reverse ColourAn optional feature (provided only with Roller Doors) that allows the colour to be put on the reverse side of the corrugated curtain face.
Reverse RollAn optional feature for selected rolling doors installed on the outside of an opening.
Safety Reversing SensorsAre a door control accessory to sense an obstruction and safely reverse the door. Types of Safety Reversing Sensors include optical pressure sensitive or electro magnetic (e.g. infra-red radio frequency proximity switch) activation.
Shaft or Cross ShaftIn rolling doors the central solid steel drum axle. In Sectional doors the hollow pipe or solid steel bar that has the counterbalancing springs and cable drums fitted to. In counterweighted doors the hollow pipe or solid steel bar that couples one side of the door drive system to the other.
Shoot-Bolt (or Throw Bolt)A throw bolt without provision for padlocking. See also Pad-bolt.
SideroomOn the internal wall adjacent to the door opening the measured horizontal distance to the nearest obstruction from the edge of the door opening.
Single-phase240v – 50Hz mains power supply.
SlatAn extruded or roll formed length of steel or aluminium shaped to interlock and form the curtain of a Roller Shutter. Slats come in various profiles and sizes and can also be made from morticed timber.
Solenoid BrakeIn Automation where a brake motor is used the brake is activated by a solenoid.
Stepped-out or Stepped-inLintel Counterweight doors usually fit under the lintel however the lintel may not be in line with the fixing face. It may protrude outwards or protrude inwards from the plane of the fixing face. In design we assume that these internal surfaces are flush or in the same plane. Therefore the location of the lintel must be defined.
Tapered BottomAn angled door bottom custom-made to suit a sloped ground.
Terminal ContactThe connection point for ancillary equipment/accessories to interface with the door controller.
Three-phase415v- 50Hz mains power supply.
Tilt-Up Door (spring balanced)A one-piece tilting spring balanced door.
Torsion BarIn sectional doors this term is used for the counterbalancing cross shaft that is fitted with the torsion springs and cable drums etc. It can also apply to the steel tool bars used to tension door springs.
Torsion SpringIn rolling doors the torsion spring is a helical coil of tempered spring wire that is wound up to provide torsion. It is fitted within a drum. In sectional doors the torsion spring is fitted around the cross shaft and wound up to provide torsion.
Travel RiseThis term refers to the maximum height that the top leading edge of the door travels to before it settles into a horizontal open position. Height clearance is therefore required in this zone right across the opening. The depth of the zone is defined by the Internal projection distance. Also referred to as ‘Travel Arc’ ‘Travel Headroom’ Arc of Travel’ or ‘Door Rise’.
UPSUninterruptible Power Supply to operate a door whilst there is a power outage. It is an electrical unit containing an inverter and storage batteries to provide limited run time power back up.
VentilationAn optional door feature typically using perforations or slots to provide airflow into a building. Other forms of ventilation including bar grille mesh louvre may also be available.
Visual accessAn optional door feature allowing visibility through a door.
Weather-sealA horizontal strip made of PVC or other material attached to the bottom of the door (typically in a bottom rail). It is used to minimise the gap between the bottom of the door and slightly uneven ground and to reduce rain and leaves entering under the door.
Wicket GateOutdated term. See Personal Entry Door
Wind load (wind pressure)In general doors are designed to AS NZS 1170.1 and .2 2011 Structural Design Actions- Wind Actions. This standard specifies the design loading or force measured in kPa that the doorset must withstand. Unless specified otherwise the minimum design load is ULS; 0.8 kPa SLS; 0.51 kPa.
Wind SpeedMeasured in metres/second design wind speeds for various regions are specified in AS NZS 1170. 1-2 2011. It is the basic unit used in the formula to determine the design wind pressure or wind load. NOTE: Wind speed is not equivalent to wind load.
Windlock door guidesUsed in Cyclonic or high wind load prone regions roller shutters are fitted with windlock guides which include an inner edge strip that the windlock latches against when the curtain is subject to large deformation under high wind load.
Windlock or Windlock ClipA specially made steel end clip riveted at the end of a roller shutter slat that locks within the windlock guide when the curtain is subject to large deformation under high wind load.
Zone of TravelThe physical space that the door leaf/s swing/s through as the door opens or closes. When projected down onto the ground under the door it forms a zone that must be left unobstructed for safe door operation.