Vertical Sliding Windows There are two types of vertical sliding windows.   Smaller windows - Guillotine shoot bolt Larger windows - Spiral balances Lift-out units & hinged units     Standard single lift out or Lift-out over lift-out or Shaped     Vertical Slider   Slim standard hinged units or Hinged units in outer frame

Frame Units (Fixed Units Only) We can supply you images in many styles, for example:   Circular units fixed only   Square Units fixed or hinged   Arched Units    fixed or hinged   Fixed or Hinged Units

Technical Specifications Metal sections are manufactured from HE9 extruded aluminium to BS 1474 and standard finish is anodised to BS 1615 AA5. Alternatively white finish to interpon LA 198E, Brown finish to interpon BS 08B 29, plus any standard ral colours P.O.A. Sealing for the slide units is by twin Polypropylene Weatherpile, and the hinged and fixed are sealed by the use of long-life closed cell expanded neoprene. 4, 5 or 6mm glass or 6.4mm laminated glass may be used as required. Glazing is with flexible P.V.C. gasket.

Horizontal Sliding Windows Our horizontal sliding windows blend unobtrusively with most types of existing windows. Highly efficient sealing qualities are combined with easy opening action. Fitted with nylon skids or ball raced stainless steel rollers. Horizontal and vertical slide (see next page) units, are doubly sealed with twin Polypropylene Weatherpile. Hinged units are retained closed by casement turnbuckles. Horizontal Sliding Windows can be supplied with additional panels if required.     Three Panel Slider   Two Panel Slider

Flyscreens

A superb range of internal and external screening systems covering the whole spectrum for window and door applications.

The use of these products in commercial applications comply with the existing food hygiene regulations preventing the entry of disease carrying insects and reducing the reliance on chemicals and sprays:

The Food Safety (Food Hygiene) General Regulations 1995, states: "... windows which are opened to the outside environment must where necessary be fitted with insect proof screens...."

The products are already well accepted and widely used in Europe not only for commercial applications but also domestic.

Full specification of images, fixings and screening materials are available on request.

Profiles
All profiles are extruded aluminium. Most products are available in White or Brown paint and silver anodised finish. Mill finish available on selected profiles.

Mesh
Aluminium or fibreglass-standard mesh 18 x 16 (strands per square inch). Fibreglass available in three colours grey, charcoal or white. Aluminium mesh is available in silver, charcoal and black finish.

Other mesh types are available for insect and/or sun control uses. Most mesh types will fit into the complete range of our profiles.

The PVC coated fibreglass and aluminium mesh is rot proof, fire resistant and can be easily cleaned, they allow full ventilation with minimum visual obstruction secondary glazing

When noise is a problem a double window system will provide noticeably better soundproofing than a single window even if this is fitted with double glazed units.

What is noise?

Noise is unwanted sound and our response to it is therefore partly subjective. One person's noise may be another's music. Noise from traffic, aircraft, trains or other people's work and leisure activities can badly affect our living or working environment leading to disturbance in concentration, build up of stress and in extreme circumstances, a real detrimental influence on our health.

Measurement

Sound is measured as a pressure and is expressed in decibels (dB). 0dB is defined as the pressure level at the threshold of hearing and 120dB marks the onset of pain. The scale is logarithmic and an increase in SPL of 10dBA approximates to a doubling in the loudness of the sound whereas a change of 3dBA is just about noticeable.

Our ear responds to loudness which is dependent both on the sound pressure level and the frequency of the sound. The ear is more responsive to higher frequencies and so these appear louder than a sound of lower frequency having the same sound pressure level. Measuring equipment can be weighted to mimic the ear's reaction and measurements are then defined as 'A' weighted or dBA.

The ability of a material to absorb sound is assessed in the laboratory by taking measurements over a recognised range of frequencies between 100Hz and 3150Hz. The average of these measurements is expressed as Rm or the Mean Sound Reduction Index. When adjusted for the ear’s response to loudness it is termed Rw or Weighted Reduction Index and is expressed in dB.

Noise levels

The typical noise level from a busy road is 70-80dB and noise levels from aircraft and trains can be as high as 90dB. The Code of Practice covering sound insulation and noise reduction for buildings, BS8233:1999, identifies reasonable noise levels for bedrooms at 30-35dB, classrooms and meeting rooms at 35-40dB and open plan offices at 45-50dB. Sound reductions in the range 35-45dB are therefore routinely required.

Performance

Single glass - 30dB
4mm single glass in a fixed pane will provide sound insulation of approximately 30dB but the performance of a window with opening panels is also dependent on the quality of any seals. Gaps or cracks representing just 1% of a window area can reduce the sound reduction by as much as 10dB and a typical older window will achieve only 18-25dB.

Sealed units - 30dB
A standard sealed unit has 2 sheets of 4mm glass coupled by a rigid spacer, normally 16mm. The two panes vibrate together and Rw stays at 30dB i.e. no improvement. Changing one pane for a thicker glass can offer + 3-5dB but poor seals in the window could reduce sound insulation by 10dB

Secondary windows - 38dB+
Secondary window are purpose-made to cover the whole window thereby minimising sound transmission through the passage of air. Frames are sealed to the structure using either compression seals or non-setting mastics and opening panels are fitted with compression or brush seals to fill any gaps and allow the glass to develop its full acoustic potential.

The typical Sound Reduction Index is 38-40dB, owing to the availability of a much larger air space between the inner and outer glass which decouples the movements of the component glasses. A minimum air gap of 100mm is recommended and higher levels of sound insulation are obtained as the gap increases although for cavities beyond 200mm, the improvement is minimal. Further gains of 3-5dB can be made by using thicker glass or acoustic laminates and lining the space between the windows with sound absorbent material.

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