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. They often incorporate magnetic-type weatherstripping, similar to the seal on a refrigerator door. Both of these factors combine to cut air leakage substantially. If a wooden door is preferred, a tight-fitting storm door, combined with good weatherstripping, will help.
Radiant losses occur primarily through glass.
When possible, the use of glass in doors should be minimized or avoided. Copyright 2000 Enercom, Inc .