With the SANS 204 Thermal bylaw and new SANS 10400 XA Building regulations architects, developers and engineers have shown a lot of interest in our Low E Window films, which do not only reflect Solar Energy/heat  up to 75%, but also increase the thermal insulation of glass up to 92% (similar to standard double glazing) while reducing UV damage by 99%.  The combination of our Low E films with clear laminated glass can generally be done at 20% less per m² than Low E glass or Double glazing.  Some important points regarding the new regulations:

• Buildings with fenestration area per storey exceeding 15% shall comply with the requirements for fenestration in SANS 204  - Natural and artificial ventilated buildings in each Climatic zone - have a different set of constants/calculations that needs to be done.  (The constants are provided in the SANS 204 bylaw document).  With buildings with Artificial ventilation/air-conditioning, Energy constants, and Heating/cooling shading multipliers need to be included in the calculations.

• Conductance is a measure of the heat that can pass through a material within a given time. Conductance must not exceed the net floor area multiplied by a conductance constant and = glazing area x U value of the window.

• Solar heat gain is a measure of the solar radiation passing through the window resulting in an increase in the temperature of the room. (i.e. how well a product blocks heat from the sun. The lower the SHGC, the better a product is at blocking unwanted heat gain. SHGC is expressed as a number between 0 and 1;   Solar Heat gain must not exceed the net floor area multiplied by a Solar Hear Gain Coefficient (SHGC) constant and = glazing area x solar heat coefficient (and solar exposure factors).

What is very clear and important to note is that the better glass is insulated/the lower the U-value and the better/lower the SHGC value (generally not great with Low E glass and standard double glazing) the easier it will be to achieve compliance and the more flexibility it will give design professionals in terms of the amount of glazing & windows that can be used in a design/development.  This is obviously important to ensure sufficient natural light and external views.  We have included a brochure and some info regarding these films:
Llumar Low E window films -   based on NFRC assessment methods: (Click for larger image)
 

1. Llumar Enerlogic 35 (Warm grey/light brown colour internally – Silver grey Colour externally). The film’s Solar Heat-Elimination” is 75%,  VLT of 32%,  with a U-value of 3.4 w/m².K (increase insulation by 92% similar to standard double glazing-Specified for the Nettleton Ridge Villas and Mutual Park in Cape Town)

2. Llumar Enerlogic 70 (Neutral - Appears almost like normal glass).  The film’s Solar Heat-Elimination” is 50%,  VLT of 68%,  with a U-value of 3.4 w/m².K (increase insulation by 92% - similar to standard double glazing)

3. Llumar LE 50 (extremely clear – won’t notice it on the windows internally – Very light champagne colour externally ).  The film’s Solar Heat-Elimination is 58%,  VLT of 50%,  with a U-value of 4.5 w/m².K  (increase insulation by 40% - Specified by Spoormaker Engineers for the Old Mutual Greens school project)

4. Llumar VS60 (Natural colour - Appears like normal glass) - The film’s Solar Heat-Elimination” is 58%,  VLT of 58%,  with a U-value of 4.8 w/m².K  (increase insulation by 25%) 

 
The 99% UV protector in all the Low E films will also protect the office furniture, blinds etc.   Llumar films have proven to last more than 20 years and these LLUMAR LE films have a 10 year warranty.  The Enerlogic LE Films have a 15 year warranty.