CALL TOLL FREE: 877.826.3828

ROLOK PRODUCTS
4800 N. Channel Ave.
Portland, OR 97217

Go to Sheet Metal Products PageGo to Sheet Metal Ordering PageGo to Sheet Metal Delivery PageLearn About ROLOK ProductsContact ROLOK ProductsGo to ROLOK Products Home Page
Return to Order Page

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.



2007 © TCM CORP.