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.

Double wall spiral duct specifications.

Dual wall double wall insulated spiral is available with solid or perforated liners. 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. Double wall flat oval duct and fittings are also available in carbon steel paintable galvanized steel and a luminized steel.

E z flange with barrel clamp 26 to 96 diameter. 1 2 and 3 insulation thicknesses are available. Mylar barrier is available as a barrier between perforated liner and insulation. 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.

Smc constructs each piece with an inner shell perforated or solid surrounded by a layer of insulation and covered by a solid outer shell. This requirement is applicable to 20 gauge or less in thickness and 3 w g. These holes effectively channel system noise flanking noise and cross talk noise into the insulation layer where it is absorbed. Double wall fittings are manufactured on our state of the art fabrication equipment.