Clement Window's EB14 Steel Windows

The Clement EB14 Steel Window Technical Specification

Product Summary

A very slim, elegant suite providing a conventional appearance for all configurations of traditional metal windows, EB14 steel windows have been created specifically for use in sensitive fenestration projects where a traditional steel window look is required.

The advantage of EB14 windows is that they are available externally glazed with a 14mm unit and consequently they are frequently specified for use in Conservation Areas, Listed Buildings and dwellings of historic interest. EB14 windows can be suitable for new build projects or refurbishment projects, where the appearance of the original fenestration is to be maintained and windows may be manufactured to fit existing apertures.

Part L Regulations

Part L approved, using the centre pane glass U value method.

Manufacturing Specification

Made to suit your individual requirements EB14 windows are generally manufactured in accordance with BS 6510:2010 specifications for hot rolled steel windows. The mild steel sections used for Clement window and door frames are precision rolled in Switzerland using only recycled steel to suit Clement’s unique profiles and tolerances. All frames and ancillary profiles are hot dip galvanised to BS EN ISO 1461 and available with a factory applied polyester powder coating to BS EN ISO 13438 from the RAL colour range, exceeding the minimum paint thickness over the zinc of 60 microns.

Manufacturing Description

Frames are manufactured from hot rolled mild steel profiles with corner joints mitred, welded and dressed square and flat. Small panes can be formed with T glazing bars whose ends are tenon riveted and/or welded to the frame and cross joints are interlocked and welded with rigid joints. Composite windows can be assembled by connecting windows horizontally and/or vertically with mullions and/or transoms of hot rolled slim steel profiles. Box sections are available as tubes or as box mullions which can be either hot rolled or manufactured from sheet steel. Pressed metal cills are available in a choice of profiles. Trickle vents can be fitted in accordance with Part F of the Building Regulations.

Locking system

The EB14 range of windows is available with traditional single point locking and other security devices if required.


EB14 windows can be fitted into timber subframes, or direct to brickwork, concrete or stone. Windows are installed using fixing lugs or stainless steel screws.


EB14 can be supplied with various glazing options, from both inside or outside including:

  • Clear glazing
  • Georgian bars: using our G+ welded bar system; an engineered welded steel strip in a horizontal or vertical pattern
  • Genuine T bars
  • Leaded lights, using real lead that is soldered by hand in a diamond or rectangular pattern in variable widths of lead.

Combinations of fixed lights, top hung, side hung and bottom hung windows are available as well as single and double doors in both ‘open in’ and ‘open out’ configurations.

EB14 windows are ideal for 'like for like' replacements accommodating both horizontal and vertical glazing bars. They include an insulated glass unit of 14 mm thickness with a chamfered clip-in bead locking system.

In accordance with Glass & Glazing Federation best practice, Clement steel windows are generally factory glazed, however, our concealed fixings mean that fixed light windows need to be glazed on site after the frames have been installed. Glazing beads are made of aluminium.

EB14 windows can be supplied with semi, round or gothic style heads, and ‘curved on plan’.

Dimensions (Provided for guidance purposes only)

Nominal profile width: 25mm
Typical sight lines: fixed lights perimeter: < 40mm
Hinged casements: < 55mm

Windows and doors for composite panels are bespoke, generally within the limits shown in the table below; sizes outside these limits may be discussed with one of our sales consultants.

  Width Height Perimeter
WINDOWS Min (mm) Max (mm) Min (mm) Max (mm) Max (mm)
Fixed light 300 1800 300 1800 7200
Top hung 300 1800 300 1300 4800
Side hung 300 600 300 1300 3800
Bottom hung 300 1200 300 1200 4800
Single 600 900 2000 2100 6000
Double 900 1200 2000 2100 6600



The average Sound Reduction Index (SRI) of a single glazed unit is approximately 30 dB, but this varies with window type, size and glass thickness.

BS 6375-1:1989

Air permeability was measured in terms of opening joint length (m³/h/m) against progressively increasing test pressures through 200Pa (class A), 300Pa (class B) up to 600Pa (class C). Class B, or a maximum value at 300Pa of about 16 m³/h/m, was the UK standard requirement. Water tightness was measured in resistance to leakage at progressively increasing test pressures, 300Pa being considered the most severe UK requirement. Wind load resistance entailed deflection and gusting tests at pressures ranging from 1200Pa to 2400Pa.

Window Type BS 6375-1 Test Pressure Class 1989 edition
  Air Water Wind BS 6375-1 Exposure Category
Fixed light 600 300 2400 2400
Top hung 300 200 2000 2000
Side hung (open out) 300 200 2000 2000
Bottom hung 200 100 1600 1200

Source: Steel Window Association