These range from 1.9 W/m2K u value soft coat low E glass and Krypton gas and this goes down to 1.0 u value depending on the cavity and glass used .
Sightlines of our warm edge spacers do not affect the thermal value and these are 8mm (Heritage), 8mm (Standard), 9mm or 11mm if required.
N.B. We recommend that a minimum of 3mm o/a is deducted from the tight size of the opening to arrive at the unit size.
The lower the u value the better the thermal efficiency of the unit.