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 spiral duct specifications.

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. 1 2 and 3 insulation thicknesses are available. 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. K value is 0 27.

Mylar barrier is available as a barrier between perforated liner and insulation. Dual wall double wall insulated spiral is available with solid or perforated liners. 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.

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. Double wall fittings are manufactured on our state of the art fabrication equipment. 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. E z flange with barrel clamp 26 to 96 diameter.