Brinmar's SBLHD Residential 42,000 to 150,000 BTU Reciprocating Compressor Sound Blanket Provides a Minimum 5 dB Sound Reduction which Represents a 40%+ Reduction in Noise Levels. The Inside of the Blanket is Lined with a Rubber-like Substance that Traps the Sound Inside the Blanket, then a 1" Layer of Glass Insulation Absorbs the Noise. During Installation the Blanket Naturally Adapts to Accomodate the Various Positions of the Suction/Discharge Lines and Control Box. Hook and Loop Straps make the Blanket Easy to Fasten and Install