Fiberglass back meets or exceeds the following tests and ratings:
Bonded foil vapor barrier minimizes condensation
Deep plenum cavity improves performance
6"-14" diameter prescored back allows neck to be determined at time of installation
Back labeled with necessary code approvals
Meets 25/50 tested in accordance with A.S.T.M. E84 (UL 723)
U.L. 181 Erosion and Impact Test
"R" Values of 4.2 and 6.0
Approved for city of Los Angeles 

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Faxne   800.223.8461