As we know a major part of a window is made of Glass and glass plays a big role in making a window Thermal efficient. Enerstar uses a Warm Edge spacer bar system called Edge Tech from Termco to overcome lots of issues that comes up with time on a conventions Aluminum or steel spacer that all the major competition is using.

Butyl Seal All Around –
A secondary seal Butyl all around the glass plays a major role in the seal and structural integrity of the big glass units. A warm edge spacer with advise along the edge plays as a first seal and then a full Butyl seal filled all around the glass as a second major seal from the elements. This results a far less chance of any glass failure down the road. However on the other hand Cardinal only seals the corners only with a very minimal Silicon based sealant.