Double Wall Spiral Duct Specifications

1 2 and 3 insulation thicknesses are available.

Double wall spiral duct specifications.

E z flange with barrel clamp 26 to 96 diameter. Double wall flat oval duct and fittings are also available in carbon steel paintable galvanized steel and a luminized steel. Smc constructs each piece with an inner shell perforated or solid surrounded by a layer of insulation and covered by a solid outer shell. 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. 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. 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. K value is 0 27.

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. Aluminum double wall flat oval duct and fittings are available in larger sizes and greater metal thicknesses on special order. Dual wall double wall insulated spiral is available with solid or perforated liners. 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.