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ROLOKOUSTIC Double Wall Fittings

Sound Absorption Coefficients for Fiberglass Liner

Thickness Sound Absorption Coefficient at Frequency (Cycles per Sound)

Permacoate Linacoustic Standard

(inches)	125	250	500	1000	2000	4000	NRC
1" Inner Wall Insulation	.09	.29	.67	.89	1.3	.99	.70
2" Inner Wall Insulation	.22	.67	.99	1.09	1.04	1.05	.95

Permacoate Linacoustic HP

(inches)	125	250	500	1000	2000	4000	NRC
1" Inner Wall Insulation	.09	.31	.69	.91	1.02	1.03	.75

Coefficients were tested in accordance with Test Method ASTM C 423-81 and ASTME E 795.

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