Double Wall Spiral Duct Specifications

Dual wall double wall insulated spiral is available with solid or perforated liners.

Double wall spiral duct specifications.

Double wall flat oval duct and fittings are also available in carbon steel paintable galvanized steel and a luminized steel. 1 2 and 3 insulation thicknesses are available. In double wall round spiral duct a metal inner liner insures that high airflow velocities cannot separate insulation by pulling away from the duct s outer wall and creating erosion or airflow problems. Smc double wall round spiral duct is a dependable erosion resistant alternative to lined round spiral duct providing improved protection for insulation exposed to the airstream.

Standard lengths of longitudinal seam k27 duct are 5 and 6 feet. This requirement is applicable to 20 gauge or less in thickness and 3 w g. When noise reduction is required the inner wall of dual wall spiral pipe is perforated with thousands of 3 32 holes on 3 16 centers. These holes effectively channel system noise flanking noise and cross talk noise into the insulation layer where it is absorbed.

K value is 0 27. Smc constructs each piece with an inner shell perforated or solid surrounded by a layer of insulation and covered by a solid outer shell. E z flange with barrel clamp 26 to 96 diameter. Double wall fittings are manufactured on our state of the art fabrication equipment.