City Hangar Construction
Peterson Air & Space Museum
21st Space Wing/MU
150 East Ent Avenue
Peterson Air Force Base CO 80914-1303

The City Hangar (Bldg # 979) and Terminal  (Bldg # 981) were closed to the public during Dec 04 and Jan 05 for heating, air conditioning, and electrical upgrades. Both buildings opened again to the public by mid Feb 05. Below photos, by Ernie Newman, show some of the duct work in the City Hangar 
http://www.petemuseum.org