The Metal Core is constructed from perforated and corrugated dead soft aluminum with mechanical interlocking seams.
The Fiberglass Insulation is used between the core and outer shell.
The Outer Shell is constructed from dead soft aluminum that is corrugated with mechanical interlocking seams to form an air tight, flexible, metal duct.
The End Treatments are constructed from aluminum that is mechanically fastened to the core and outer shell then sealed with UL 181 duct sealer to create a flexible, air tight, sound attenuator.
Triple Lock Sound Attenuator Product Sheet