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In the UK (and other parts of the EU), 'insulated' roller garage doors are available, using an aluminum lathe filled with polyurethane foam for thermal and acoustic insulation. Concerning thermal insulation, the roller door has a typical insulation R-value of 4.9 to 5.2. A sheet steel garage door has a typical insulation R-value of 0.5 to 2.7.
A typical installation of insulated glass windows with uPVC frames. Possibly the earliest use of double glazing was in Siberia, where it was observed by Henry Seebohm in 1877 as an established necessity in the Yeniseysk area where the bitterly cold winter temperatures regularly fall below -50° C, indicating how the concept may have started: [2]
The doors form a 2.5 m (8 ft 2 in) high glass and steel screen the entire length of the platform. The door opening is 2.1 m (6 ft 11 in) wide, and the system includes integrated passenger information and digital advertising screens.
So if it has a centimeter of padding and your head hits it at say 10 meters/second (20mph or so)- your accelleration is (10x10)/(2x0.01) which is 5000 meters/sec 2 - which is over 500 g's! But if the airbag deploys in time - then you are slowing down over a distance of perhaps 10 centimeters instead of 1 centimeter.
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