A superior technology designed to minimise energy loss through your windows
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See also:
Building Regulations and Window Energy Ratings
Unglazed Frames
If a window installer sources insulated glass (IG) Units and window frames from separate suppliers, all parties (window installers, profile manufacturers/fabricators and IG manufacturers) will need to consider the following when applying for WERs:

1. Check for existing WERs on file
2. Get your IG components list
3. Are components exchangeable?
4. Get your thermal conductivity values
5. Consider Aluminium and Warm Edge
6. WER Simulation Requirements