Round – Double Wall Standard

Accoustically Lined K-2775 High Pressure Duct


Combining the acoustical advantages of lined duct with the permanence of a galvanized steel liner, K-2775 comes with a K factor of .27 Btu/Hr./Sq. Ft./°F at 75° Fahrenheit mean temperature. Fitting seams are continuous welded MIG welds, with a silicon bronze wire and Argon shielding.

With a sound rating similar to United K-27 duct, K-2775 features lining perforations of 3/32” diameter, with no more than a 23% free area. To ease installation, all fittings have couplings with stop beads built into their construction; liners are built with an extended coupling to aid field assembly.

Construction & Advantages

ADMP’s round double wall duct is constructed with a fiberglass insulation layer between a solid metal outer shell and either a perforated or solid inner shell.

Double wall duct has both acoustical and thermal insulation advantages. Acoustical double wall duct has a solid outer shell and a perforated inner shell to effectively reduce system noise. Thermal control double wall in constructed with solid inner and outer shells for assured thermal conductivity and vapor barrier integrity.

One important advantage of double wall duct is that fiberglass insulation and sheet metal screws are not exposed to the air stream, permanently protecting the insulation and eliminating the possibility of it disconnecting from the outer shell of the ductwork.

Double wall duct is ideal for applications such as schools, hospitals, and laboratories. In exposed duct settings, double wall has a clean look that is much more aesthetically pleasing than externally insulated duct.

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