portion ofexterior windows above 30 inches and below 9c inches that permits a view to the outside. Endnotes U.S. Environmental Protection Agency. Health Buildings, Healthy People: A Vision for the 21st Century.. 2001. http://www.epa.govfiaqfhbhp/hbhptoc.html (accessed Nlay 2008). U.S. Environmental Protection Agency. Unfinished