Technical glossary
Key terms around front doors – explained briefly.
Hinge side / opening (DIN)
Indicates hinge side and opening direction: DIN left/right, inward/outward opening.
Multi-point locking
Additional hooks/bolts secure the leaf at several points in the frame for better security and sealing.
Automatic lock
Locks automatically when the door closes – no manual locking required.
Motor lock
Electrically actuated (e.g. INOSMART) for convenient unlocking via fingerprint, PIN or app.
Profile cylinder
Lock cylinder, optionally with emergency function and security card.
Emergency function
Door can be opened from outside even if a key is inserted inside.
Hardware / security plate
Exterior hardware with cylinder protection – hinders drilling/pulling.
Hinges
Carry the leaf; adjustable; optional hinge‑side security.
RC classes
Resistance classes (RC1–RC3). RC2 is common for burglary resistance.
ESG / VSG
Toughened safety glass (ESG) / laminated safety glass (VSG).
U‑value (Ud)
Thermal transmittance in W/m²K – lower means better insulation.
Driving rain tightness
Resistance to rain penetration under wind pressure.
Air permeability
Air passing through joints under pressure – relevant for efficiency.
Seals
Multi‑stage rubber gaskets in the rebate for better sealing.
Threshold / barrier-reduced
Floor threshold determines sealing and access; low thresholds are possible.
RAL installation
Joint system: airtight inside, insulated in the middle, weatherproof and vapour‑open outside.
Reveal
Masonry opening into which the frame is installed.
Side panel / toplight
Fixed glazed elements next to/above the door for more light.
Recessed grip
Flush integrated grip – modern look, optional LED.
Pull bar
External bar handle in various lengths/sections.
Backplate / lever
Interior/exterior sets with long plate or short plate + lever.
Leaf / infill
Movable sash; infill denotes the sandwich structure with insulation core.
Frame
Fixed frame connecting the door to the building.
Thermal break
Prevents thermal bridges in aluminium profiles for better insulation.
Rebate
Overlapping area between leaf and frame including the seals.