Roller door, while securing our properties and adding style and sophistication, come with plenty of jargon that can confuse a layperson. We at Dura Ultima have taken it upon ourselves to simplify these terms for you. Listed below are some of the most commonly used terms relating to the roller door.

Accessories

These items include hooks, slats, screws, metal or plastic springs, etc. – items which help assemble and hold the roller door together.

Anodise; anodised

Refers to a hard, non-corrosive oxide which is created by electrolytic action. The electrochemical process forms a thin film that coats aluminium door. This coating is essentially a conversion of aluminium to aluminium oxide. It is usually clear, without colour and yields a satin finish.

Anti-drop break

This device is fitted inside the roller door and prevents the curtain from dropping in case of a mechanical failure. Anti-drop brakes are installed in both manual and electric roller door and are an essential requirement, particularly for shutters used in openings where people or vehicles pass through.

Barrel

A metal tube around which the roller shutter curtain rolls around. It houses the tube motor for electric single phase door and springs for spring loaded shutters. It is also referred to as the counterbalance pipe.

Barrel assembly

A horizontal and cylindrical component at the head of the opening. It supports the curtain and houses the counterbalance springs.

Barrel motor

Another name for tube motor that is found in all roller door. It is long and cylindrical in shape and sits inside the barrel around which the curtain rolls.

Barrel ring

This piece of technology is attached to the barrel and is used to increase the wrap diameter of the curtain. It is attached to the top slat of the curtain.

Bottom rail

A reinforcing component fitted at the bottom of the curtain.

Brackets

These are plates bolted to the guide wall that help support the barrel and form closures for the hood.

Caps

These are fixed at both ends of the barrel.

Control buttons

Also called the control box. It is the remote control device used to operate your roller door.

Counterbalance assembly

Consists of torsion springs, spring anchors and shaft, all fitted inside the barrel assembly.

Curtain

Interlocked slats assembled in a way to form the roller door.

Cycle

A complete action of your roller door from a fully closed position to a fully opened one and returning to fully closed.

Endlock

Endlocks are attached to slats to prevent lateral shifting.

EPDM Rubber weather seal

Stands for Ethylene-Propylene-Diene Monomer Rubber. It is a type of synthetic rubber, which is used to seal the gap between your roller door and the floor. This prevents water, moisture, dust and dirt from entering your property.

Galvanised metal

Galvanised metal undergoes the galvanisation process which is coating metal sheets with a layer of zinc. This protects the metal from rusting and corrosion, giving it a much longer life than when compared to non-galvanised steel.

Nylon poly guide

All roller door are fitted with nylon poly guides, attached along each side. This prevents friction and promotes smooth and quiet operation. They are also called profile guides.

Pelmet

The pelmet is an angled box made of aluminium located at the top of the roller door. It conceals the rolled up shutter. It is also referred to as the header or headbox.

Perforations

Small holes punched in a row. This is specifically used to refer to perforated shutters – roller door with 1mm – 3mm perforations – that provide visibility along with security.

PPGL

Stands for Pre-Painted Galvalume. Refers to galvanised metal sheets before the coat of paint is applied.

Polycarbonate

A class of robust and transparent thermoplastic resins. Polycarbonate sheets are used in eyewear, shatterproof windows and in polycarbonate roller door. Polycarbonate is an incredibly resilient and durable material - 250x stronger than glass, but 6x lighter.

Slats

Cold roll-formed or extruded components that together form the curtain. Slats are interlocked in such a way that they form a water-shedding surface.

Torsion springs

A helical wound spring that is mounted inside the steel pipe or barrel and is used to counterbalance the curtain.

Windload

The amount of wind force a rolling door can withstand without pulling out of the profile guides. Dura Ultima’s Industrial Roller Door can withstand wind speeds higher than 140kmph.

Wind-lock clips

Malleable iron castings, riveted at predetermined intervals at each slat end, to prevent the roller shutter from dislodging from the profile guides under heavy wind load. Used in conjunction with wind bars in guides.

We hope simplifying these terms has helped with you better understand the working of the roller door. If you’re looking to install one in your premises, contact us at Dura Ultima and let our team of professionals help you identify the roller door to best suit your needs.