EB14 Technical Specifications

Introduction
Slimline beaded framing system providing a conventional appearance for all configurations of traditional metal windows, frequently specified for Conservation areas, Listed buildings and dwellings of historic interest. EB14 windows have been designed specifically for use in sensitive fenestration projects where a traditional steel window appear- ance is required with the added advantage of being externally beaded and having a 16mm unit. Horizontal and vertical glazing bar design options are available. Projects may be new build or refurbishment where the original fenestration is to be maintained and windows may be manufactured to fit existing apertures. Steel windows may be fixed direct to brickwork, concrete, stone or into subframes.

Features include:
Horizontal and vertical glazing bars polyester powder coating weatherstripping ideal for 'like for like' replacement accommodates insulating glass units of 14 mm thickness and chamfered clip-in bead locking system.

The EB14 range consists of:
Fixed light, top hung, bottom hung, side hung, single and double doors

Specification
The windows are manufactured generally in accordance with BS 6510:1984 Specification for F series steel windows. All frames and ancillary profiles are positively rust-proof by hot dip galvanising to EN ISO BS:1461 and available with a factory applied polyester colour coating to EN ISO BS:6497.

Description
Composition, manufacture Frames are manufactured with corner joints mitred, welded and dressed square flat. Small panes can be formed with tee glazing bars whose ends are tenon-riveted and/or welded to the frame and whose cross joints are interlocked and welded with rigid joints. Profiles are hot rolled from mild steel and cold straightened.

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, tubes, or box mullions manufactured from sheet steel. Pressed metal cills are available in a choice of profile.

Glazing
Windows may be single glazed using maximum 6 mm glass or double glazed with sealed units of 14 mm thickness. Glazing is on site, from outside, with bedding and capping sealants in accordance with manufacturer's preferred glazing system. Beads are, generally, of aluminium extrusion which locate into factory fitted carriers.

Weatherseals
Ventilators are weathersealed with neoprene weather strips retained and secured on plastic studs within the profile. Under no circumstance should weatherstripping be painted.

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

Windows and doors for composite panels are purpose made, generally within the limits shown in the table below; sizes outside these limits may be considered with consultation.

Appearance
EB14 windows provide the traditional qualities of slender sight lines of framing and glazing beads, which maximizes solar gain thereby saving energy through reduced use
of artificial lighting. Its proprietary clip-in chamfered bead closely resembles traditional outside putty glazing. Polyester powder coating is available to any BS or RAL refer- ence colours.

Performance

H ea t
EB14 steel windows with insulating glass units and an air space of 6mm, have typical 'U' values of 3.7 W/m2k with ordinary clear float. 'U' values can be reduced with the
introduction of insulating glass units constructed of 1 x 4mm float, 1 x 4mm 'Val U' and 6mm xenon gas filled cavity. Using this glazing specification it is possible to achieve a centre pane measurement 'U' value of 1.1 W/m2k.

Sound
Average sound reduction index (SRI) of a single glazed unit is approximately 30 dB, but varies with window type and size.