Infra-red tab on Panes Dialog.
The long wave transmittance at normal incidence.
Note that although EnergyPlus data input allows a range of inputs between 0 and 1 the only value that is allowed in the calculations is zero so this value is now fixed at zero.
Enter the inside (back-side) and outside (front-side) hemispherical emissivity properties of the pane. Note that emissivity is 1 minus the infra red reflectance value.