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Check out how other products measure up to our uPVC products by clicking on "ABOUT US".

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Kool Windows manufactures window frames and doors from uPVC (Unplasticised Poly Vinyl Chloride). We produce standard size as well as custom made windows and doors. Our profile supplier is ISO 9001 certified and our profiles exceed the German standard DIN-16830. Our products have a life span of 50 years and are suitable for different weather conditions.

  • Maintenance free: no painting, no varnishing, no putty.
  • The multi-chamber and double sealing system design of the profile, gives the window the best insulation of sound and heat.
  • Sound insulation of single layer glass windows can reduce the noise by 22 to 25dB.
  • Double layer glass can reduce the noise by 30dB.
  • Fireproof.
  • Suitable for different weather conditions.
  • The smooth surface allows for easy cleaning and maintenance.
  • High voltage shock proof.
  • Superior drainage properties.
  • High strength & extreme durability.
  • Joints are welded together.

  • To become the leading supplier of uPVC windows and doors in South Africa.
  • To make uPVC recognisable in SA as a better alternative to wood and aluminium.

  • To offer our customers prompt and friendly service.
  • To offer our customers the best prices and excellent quality.

  • To value each employee as a worthy contributor and treat them with equal respect.
  • To create a positive and happy environment to increase productivity and ultimately creating wealth for the employee.

  uPVC Wood Aluminium
Weather proof Y N *
UV resistant Y N N
Saltwater resistant Y * Y
Environmentally friendly Y N N
Fire resistant Y N *
Thermally insulated Y Y N
Maintenance free Y N N
Long lasting Y N Y
Tilt for easy cleaning Y * N
Impact resistant materials Y N Y
* Depends on the window and materials used not the frame


Performance Test Test Conditions Measured Result Allowed Result
Air Infiltration 75Pa 0.5l/sec/m2 2l/sec/m2
Positive Pressure 1000Pa 0.27mm 3.42mm
Negative Pressure 1000Pa 1mm 3.42mm
Water Penetration 200Pa No leaks No leaks
Structural Pressure 1500Pa No permanent No permanent
Operating Forces:     to start movement   30N >80N
* All orginal certificates and testing results available upon request.


Amendments of the National Building Regulations and Building Standards Act No. 103 of 1977 to introduce requirements for Energy Usage in Buildings

Consumers, Architects and legislators are increasingly focusing on the energy efficiency of building products. The British Fenestration Rating Council (BFRC), in conjunction with the UK glazing industry and European partners have designed a window rating system to meet this need for simple and accurate information.

Windows are rated using an A to G scale on the basis of their total energy efficiency, where an A-rated window is more energy efficient than a G-rated window.

The Window Energy rating assesses the whole window energy performance and covers the frame material, the frame design, the glass type and all the other components that make up the window.

'U' values are now also part of the latest Building Regulations which come into effect on 1st October 2010, where it is stated that any installed window must be a 'C' rating under the WERs or have a 'U' value of 1.6. 'U' values are widely used as a means to assess the thermal performance of building products and this includes the UK new build and refurbishment markets.

Choosing windows or doors in uPVC helps to make a home more energy efficient, but uPVC windows with double glazing will be required for maximum efficiency. uPVC window and door profiles consist of chambers for improved thermal performance as the chambers restrict heat transfer.

During Summer
A uPVC frame with double glazing keeps the interior of the home comfortable as the heat outside is not transferred inside via the windows and doors. If you use air conditioning, the heat does not escape via the windows or doors.

During Winter
The same principle applies as during summer. The cold is restricted from cooling down the interior of your home, whereas the heat generated inside the home via electric heaters etc is kept inside, thus bringing down your energy costs

Kool Window's uPVC products are the preferred choice for home owners and industry professionals with ability to meet the U-Value targets laid down in SANS 204 -2/-3 Energy Efficiency in Buildings.

Although the South African market is still largely dominated by single glazed aluminium frames, the introduction of SANS 10400XA alongside SANS 204 is hastening the shift towards uPVC with its compelling thermal performance figures. Performance values in SANS 204-2/-3 shows uPVC outperforming aluminium and steel on every window configuration.

For example, a single glazed, aluminium window achieves a total U-value of 7.9 W/m2K and SHGC (Solar Heat Gain Coefficient) or 0.81 compared with a U-value of 5.6 W/m2Kand SHGC or 0.77 for its uPVC equivalent, and even a double glazed, tinted and coated aluminium frame achieves only a U-Value of 6.1 W/m2K compared with a U-value of 3.8 W/m2K for a similar specification frame in uPVC.

According to EN ISO 10077 the overall thermal performance of a window element (Uw-Value) can be calculated in the following way. Multiplying the area Ag of the glass with the Ug-Value of the glass, multiplying the area Af of the frame with the Uf-Value of the frame, multiplying the perimeter lg of the glass with the ?-Value of the glass, which takes into account the additional losses through the edge area around the glass. All these products are added up and then divided by the overall window area Aw, which is the sum of area glass Ag and area frame Af.

Here is the formula used:

The new Building Regulations SANS 10400XA sets out that window elements should in future be calculated according to the requirements of either SANS 204-2 (Natural ventilation) or SANS 204-3 (Mechanical ventilation). For specifiers, the key difference between the two is that SANS 204-2 requires window calculations to be carried out for each storey. To achieve compliance, the Aggregate Conductance and Solar Heat Gain has to be calculated.

Click on this link to find a calculation using the SANS 204-2 tool to illustrate the conductance and heat gain of Aluminium or Steel Windows according to the Natural Ventilation SANS specs

In contrast, SANS 204-3 requires window calculations for each storey and each elevation and, to demonstrate compliance, the Aggregate Air-conditioning Energy Value has to be calculated.

The sustainability credentials of uPVC windows when compared with aluminium or timber have also recently been given a significant boost by the BRE (Building Research Establishment) which last year awarded uPVC an A+ rating in the commercial sector for its long term sustainability - the same rating which was achieved by timber and outperforming the aluminium alternatives.

The Window Energy Rating table explained: