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ROLOKOUSTIC Double Wall Pipe

Acoustical lined, double-wall duct and fittings manufactured by ROLOK Products consist of a solid outer shell, a layer of fire-resistant fiberglass insulation and a perforated inner-shell next to the air flow.

Upon request, the inner shell can also be manufactured with a solid liner for use where noise is not a factor.

The fiberglass meets the requirements set forth per UL 723 test as to flame spread and smoke developed ratings. The R-value of the insulation at 75° MT for 1"=4.⁰ for 2"=7.⁷.

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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