Double Wall Spiral Duct Specifications

Standard lengths of longitudinal seam k27 duct are 5 and 6 feet.

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. Double wall fittings are manufactured on our state of the art fabrication equipment. Smc constructs each piece with an inner shell perforated or solid surrounded by a layer of insulation and covered by a solid outer shell. Aluminum double wall flat oval duct and fittings are available in larger sizes and greater metal thicknesses on special order.

This requirement is applicable to 20 gauge or less in thickness and 3 w g. K value is 0 27. These holes effectively channel system noise flanking noise and cross talk noise into the insulation layer where it is absorbed. Dual wall double wall insulated spiral is available with solid or perforated liners.

All double wall fittings are fabricated with stiffening beads on duct sizes 19 wide and larger which have more than 10 square feet of unbraced panel. 1 2 and 3 insulation thicknesses are available. E z flange with barrel clamp 26 to 96 diameter. 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.