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10-35 Db noise reduction. 1" and 1-1/4" thick barrier consisting two layers of fire retardant foam sandwiching a layer of 1 lb./sq.ft. mass loaded vinyl. Optional finish with a 1 mil reflective, aluminized, ripstop reinforced mylar facing. Use for larger gasoline and all diesel engines for maximum quieting. Use a double layer for severe applications (up to 50 Db noise reduction). Do not use in areas where temperature exceeds 250°F.