- Anti-lift device
- A fitting that stops a gate or grille leaf being lifted off its hinges or track.
- Anti-tamper fixing
- A bolt or screw that cannot be removed with ordinary tools, used to stop grilles being unbolted.
- Bay grille
- A grille made in sections or on an angled track to follow a bay window.
- Bi-fold gate
- A gate of rigid hinged leaves that fold against each other as they slide on a top track.
- Bottom track
- The floor or sill channel a retractable grille runs in, keeping it in line and rigid.
- BS 7671
- The UK wiring regulations that fixed electrical work, including supplies to electric grilles, should follow.
- Coil box
- The housing above a roller grille that holds the rolled-up curtain.
- Collapsible gate
- Another name for a retractable grille: a lattice that folds together when opened.
- Concertina grille
- A retractable grille, named for the way the lattice folds like a concertina.
- Conservation area
- An area of special architectural or historic interest where councils control external changes more closely.
- Curtain
- The moving part of a roller grille, made of linked rods or tubes.
- Cylinder
- The part of a lock that the key turns; it can be replaced without changing the whole lock.
- Dry lubricant
- A lubricant that leaves little residue, used on grille pivots so they do not collect grit.
- Duty holder
- The person responsible for fire safety in non-domestic premises in Scotland.
- Escape window
- A window large enough and low enough to be used to escape a fire, required for many habitable rooms.
- Face fix
- Fixing a grille's tracks or frame to the face of the wall rather than inside the reveal.
- Fire risk assessment
- The documented assessment of fire risks and precautions that non-domestic premises must have.
- Fixed grille
- A permanent welded grille with no moving parts, bolted over or inside an opening.
- Galvanising
- Coating steel with zinc to protect it from rust; hot-dip galvanising is the most durable form.
- Grille door
- A hinged door made of bars or mesh, used to lock off rooms while keeping them visible.
- Guide channel
- The side tracks a roller grille's curtain runs in.
- Head track
- The top track a retractable or bi-fold grille hangs from or runs in.
- Hinged gate
- A grille hung on hinges in its own frame, opening like a door.
- Keyed alike
- Several locks that open with the same key.
- Laminated glass
- Glass with a plastic interlayer that holds it together when broken.
- Lattice
- The diagonal criss-cross links of a retractable grille.
- Leading edge
- The closing edge of a grille, where the lock box sits.
- Leaf
- One moving section of a grille or gate; wide openings may have several.
- Listed building consent
- Permission needed for works that affect the character of a listed building, inside or out.
- Lock box
- The steel housing on a grille's closing edge containing the lock.
- LPCB
- The Loss Prevention Certification Board, part of BRE, which publishes LPS 1175 and certifies products.
- LPS 1175
- A security standard under which products are attack-tested and certified to a rating.
- Manual override
- A crank or chain that lets an electric roller grille be operated without power.
- Master-key suite
- A set of locks where each has its own key and one master key opens them all.
- Mesh infill
- Steel mesh added to a gate or grille to stop reach-through or items being passed.
- Open-mesh grille
- A roller grille curtain of linked tubes that can be seen through.
- Padlock hasp
- A fitting that lets a grille be locked with a padlock.
- Pivot
- The rivet or pin at each scissor joint of a retractable grille.
- Powder coating
- A baked-on paint finish that is tougher than wet paint, used on most grilles.
- Quick-release lock
- A lock that opens from inside without a key, used on grilles over escape windows.
- RAL colour
- A standard European colour reference used to specify powder-coat colours.
- Reach-through
- Reaching through bars to operate a handle or lock from the wrong side.
- Recessed track
- A bottom track set into the floor so it sits flush.
- Responsible person
- The person responsible for fire safety in non-domestic premises in England and Wales.
- Retractable grille
- A lattice grille that slides across an opening and folds to the side when opened.
- Reveal
- The side and top surfaces of a window or door opening, where grilles are usually fixed.
- Roller grille
- An open-mesh curtain that coils into a box above the opening.
- Runner
- A wheel or slider that carries a grille along its track.
- Scissor link
- One of the diagonal bars that join the uprights of a retractable grille.
- Secured by Design
- A police-backed initiative that lists security products meeting recognised standards.
- Shoot bolt
- A bolt that shoots into the floor or head to hold a grille or gate leaf in place.
- Shopfront grille
- A wide grille behind or in front of a shop window and entrance.
- SR rating
- The older LPS 1175 security rating scale from SR1 to SR8.
- Stack
- The folded bundle of a retractable grille at the side of the opening when open.
- Steel screen
- A perforated steel panel fixed over the openings of an empty building.
- Subframe
- A steel or timber frame fixed into an opening to give a grille something strong to fix to.
- Threat level
- In LPS 1175 Issue 8, the letter that describes the toolkit used in the attack test.
- Top-hung grille
- A retractable grille that hangs from its head track, sometimes without a bottom track.
- Trip hazard
- A raised track or edge across a doorway that people could trip on.
- Void property
- A home or building that is empty between occupants.
Glossary
Security grille glossary
60 terms you will meet when choosing, fitting and maintaining grilles.