Labels:grate | person | tree | window OCR: Thermal Performance Note that there is no condensation on the glass but there significant frost on the thermally- broken aluminum frame The glass Isa better insulator than the frame The snow on the sill also shows igns of excessive air infiltr ation wood frame does not experience condensation or frost build-up under these environmental conditions Airport Des Moines IA January 1997 aluminun DASSe fros thes
