Fenestration 2 topics · 2 sources BusinessReal EstateThe arrangement, proportioning and design of windows in a building.NYC Landmarks Preservation Commission — LPC Glossary retrieved 2014-05-29 Cite ScienceEnergyThe arrangement, proportion, and design of windows in a building.US DOE Office of Energy Efficiency & Renewable Energy — Glossary of Energy-Related Terms retrieved 2014-05-26 Cite