http://rakowitz.reticular.info/?p=7

Michel Rakowitz designed the ParaSITE: “Custom built inflatable shelters designed for homeless people that attach to the exterior outtake vents of a buildings Heating, Ventilation, and Air Conditioning (HVAC) system. The warm air leaving the building simultaneously inflates and heats the double membrane structure. Built and distributed to over 30 homeless people in Boston and Cambridge, MA and New York City.”

http://rakowitz.reticular.info/?p=7