EcoVerb™ Roll - Acoustic Duct Liner

The black fabric liner faces out toward where air flows. This facing protects the absorptive cotton fibers from being eroded by moving air.

For ducts smaller than 10", use the 1/2" thick liner. For ducts 12" x 12" or larger, use the 1" thick liner. For commercial ducts 18" x 18" or larger, use the 2" thick liner.

For additional sound absorption, oversize ducts by up to 30% to allow room for a thicker liner.

Rolls typically weigh a bit more than the published spec, since density varies naturally. As a general reference, a 4' x 100' roll at 1/2" thick and 3 lb density averages about 65 lbs versus a 50 lb spec, a 4' x 50' roll at 1" thick and 1.5 lb density averages about 30 lbs versus a 25 lb spec, and a 4' x 25' roll at 2" thick and 1.5 lb density averages about 27 lbs versus a 25 lb spec. Fibrous, low-density material also tends to compress somewhat during shipping, so actual thickness on arrival can measure a little under the nominal spec.

Polyester and rayon (cellulose) fibers, treated with flame retardant, water repellent, and antimicrobial agents.

A few options, in order of common use: a utility knife (swap the blade every few cuts), an Insul-Knife (needs sharpening every few cuts), scoring the black fabric with a utility knife and T-square then finishing with an electric fabric cutter, or fabric shears.