The table below lists the R-values for different type doors. Insulated Metal 4.0-8.0 Filtration losses can also be reduced with an insulated or thermal door. Insulated metal doors do not warp, shrink, or swell with temperature or humidity changes. This means that they can be installed to a much tighter fit without interfering with their operation. Both of these factors combine to cut air leakage substantially.
Radiant losses occur primarily through glass.
When possible, the use of glass in doors should be minimized or avoided. All Rights Reserved.