An air supported structure supported by positive air pressure it required 250 000 ft min 120 m s of air to keep it inflated.
The metrodome roof.
That was before the new stadium offictally opened.
The dome consisted of an air supported fiberglass fabric roof and a 340 ton cover for the dome was held in place by air pressure generated fans and steel cables.
However the roof has collapsed four times due to snow the last in december 2010 causing the vikings game to be postponed and moved.
The metrodome roof 2020.
The first collapse of the teflon and fiberglass fabric dome roof at the metrodome occurred in november 1981 after 10 inches of heavy snow fell.
The metrodome s air supported roof was designed by the inventor of air supported structures david h.
The roof had snow melting ducts to prevent a collapse.