Radiant barrier

Radiant barrier
  A thin, reflective foil sheet that exhibits low radiant energy transmission and under certain conditions can block radiant heat transfer; installed in attics to reduce heat flow through a roof assembly into the living space.
  U.S. Dept. of Energy, Energy Information Administration's Energy Glossary
  ***
  A device designed to reduce or stop the flow of radiant energy.
  California Energy Comission. Dictionary of Energy Terms

Energy terms . 2014.

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