The SMW (Standard Metal Window) "F" series window range has been manufactured since the 1920's. SMW is only available single glazed, primarily used now for sensi- tive replacement work in Conservation Areas and Listed Buildings where double glazing is not an option.
The SMW range consists of:
Fixed light, top hung, bottom hung, side hung, single and double doors.
Features include:
Silicone fronted to replicate traditional face putty, single glazed.
Specification
The windows are manufactured generally in compliance with BS 6510. All frames and ancillary profiles arehot dip galvanized to EN ISO BS:1461 and available with afactory applied polyester colour coating to EN ISO 13458 BS:6497.
Description
A bespoke steel window. Frames are manufactured with corner joints mitred, welded and dressed square and 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 shall be prepared for glazing on site from outside with single glass, using factory finished beads, bedding and capping sealants in accordance with BS 8000-7. Option for single glazing: glazing from outside with spring clips (supplied by glazier) and metal casement putty fronting.
Weatherseals
Ventilators will be fully weatherstripped with black coloured dual contact ethylene propylene complying with BS.4255:part 1:1986, secured into extruded aluminium channels which are securely fixed to opening frames and are concealed when the window is shut.
Dimensions (mm)
Nominal profile width - 25mm
Typical sight lines: fixed lights perimeter < 40mm
Hinged casements < 50mm
|
|
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.
| |
Width |
Height |
Perimeter |
| WINDOWS |
Min (mm) |
Max (mm) |
Min (mm) |
Max (mm) |
Max
(mm) |
| Fixed light |
300 |
2000 |
300 |
2000 |
6800 |
| Top hung |
300 |
1250 |
300 |
1300 |
4600 |
| Side hung |
300 |
650 |
300 |
1350 |
3700 |
| Bottom hung |
300 |
650 |
300 |
650 |
1300 |
| DOORS |
|
|
|
|
|
| Single |
475 |
900 |
2000 |
2100 |
6000 |
| Double |
950 |
1250 |
2000 |
2100 |
6600 |
Appearance
SMW 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. Polyester powder coating is available in a range of standard RAL colours.
Performance
Wind resistance, watertightness, air permeability
All SMW windows meet the weathertightness - air infiltration, water penetration and wind loading - performance criteria generally as in BS 6375: Part 1 appropriate to the
specified design wind pressure.
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. Watertightness 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 |
Exposure Category |
| |
Wind |
Water |
Air |
|
| Fixed light |
2400 |
300 |
600 |
2400 |
| Top hung |
2000 |
300 |
600 |
2000 |
| Side hung
(open out) |
2000 |
200 |
300 |
2000 |
| Side hung (open in) |
1600 |
100 |
200 |
1200 |
| Bottom hung |
1600 |
100 |
200 |
1200 |
|
