Terminology & Descriptions

Here is an A-Z reference guide to the terminology surrounding our ECOSlide vertical sliding sash windows:

Astragal Bars – Decorative sculptured bars that give the sash the illusion it has individual panes of glass. These are positioned on both the inside and outside of the glass with a Duplex spacer bar in the sealed unit.

Cill – The bottom outer frame extruded PVC-U profile of our sash windows, available in front-to-back depths of 152mm (standard), 185mm and 225mm and featuring our signature security bar upstand. The external top faces of all our cill profiles gently slope to efficiently shed and drain rainwater away from the window.

Cill Horns – An extended piece of cill at either end of the window.

D Handles – An alternative to sash lifts, positioned internally to lift the window up. A single D handle can also be fitted to the outside sash to assist opening and closing. These are not fitted as standard. Available in White, Chrome, Gold, Satin Chrome and Black.

Decorative Sash Horns – Placed on the outside of the sash frame as an original feature. They are not fitted as standard and therefore must be specified with your quote/order. Available in White, Cream and Tan.

Georgian Bars – Internal decorative bars that create a Georgian-style window effect. Available in widths of 18mm and 25mm.

Glazing Bead – PVC-U profiles with co-extruded gaskets which snap-fit internally onto the sliding sash frames to hold the sealed double glazed units firmly in place. Our glazing beads are fitted internally for security and are a decorative sculptured Ovolo in shape (to look like an original timber window).

Insulated Glass Unit – A manufactured sealed double glazed unit, designed to provide thermal insulation. Our sash windows are fitted with efficient glass units 24mm in thickness (4mm outer glass pane, 16mm airgap, 4mm inner glass pane) and both top and bottom sliding sashes feature toughened glass for safety.

Obscured Glass – Glass formed by running molten glass through special rollers. These rollers have a pattern on them, causing the glass to become patterned and thus obscure for privacy applications.

Pole Eyes – Fitted on the inside of the top sash to assist with opening and closing. Also known as finger pulls, they are fitted as standard and are available in White, Chrome, Gold, Satin Chrome and Black.

Sash Lifts – A shaped handle positioned internally at the bottom of the sash to lift the window up. These are fitted as standard and are available in White, Chrome, Gold, Satin Chrome and Black.

Sash Locks – A locking device which holds a vertical sliding window shut, such as a lock at the mid rails of a sash window. Larger width units utilise two locks.

Sash Stops – A section of PVC-U profile that sits on the inside and bottom of the outside frame to restrict the sash from opening fully. The restriction is normally set to between 100mm and 200mm. Also known as limit stops or a frame stop.

Security Bar – An extruded PVC-U feature on the top face of our cill profiles, this specially-designed anti-jemmy upstand cleverly increases security by stopping potential intruders from using tools or excessive force to gain entry.

Spacer Bar – Used to separate the two pieces of glass in a double glazed sealed insulated glass unit.

Tilt Knobs – Sliding decorative knobs used to open and tilt the sashes, for both ventilation and easy cleaning of external window frame and glass surfaces from inside the building. Fitted as standard on all our frames and available in White, Chrome, Gold, Satin Chrome and Black.

Tilt Restrictors – Also known as arms, these metal bars allow the window to be safely tilted inwards for easy cleaning and ventilation. Our tilt restrictors have a quick-release arms feature (enabling the sash to be fully opened for fire egress) and are fitted as standard on all of our sash windows.

Thermal Inserts – A range of multi-chambered extruded bars manufactured from 100% recycled PVC-U which are inserted in the factory to strengthen sash and cill bars during the window fabrication process. These components are much more thermally efficient than traditional steel reinforcement bars, whilst also being lighter and providing better fixing screw retention during window installation.

Travel Restrictors – A shark-fin device delivering both security and safety benefits which is used to restrict the opening of the sash to 100mm, to meet current Building Regulations. Available in White, Chrome, Satin Chrome and Black.

Trickle Vents – Predominantly placed in the top sash, trickle ventilators can be placed in the head on request. If the trickle vent is placed in the head of the window, a 20mm add-on to the head must be specified at an additional cost. Trickle vents are not fitted as standard. Available in White, Brown and Tan. Please note: Trickle vents cannot be placed on windows below 600mm in width.

  • Sliding function

    ECOSlide PVC-U sash windows function like a traditional box sash window with both the top and bottom sashes sliding up and down to suit your ventilation requirements.

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  • Tilt & easy clean function

    ECOSlide PVC-U sash windows are incredibly low maintenance, requiring only a quick wipe down with a damp cloth to keep them looking as good as new.

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  • Attention to detail

    Its the little details that help make ECOSlide sash windows as authentic as possible. Our PVC-U windows are designed to be smooth and sleek with slim profile sections giving a better appearance, which is pleasing to the eye as well as offering improved views from the inside and outside.

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