Sheet Metal Connectors, Inc. manufactures double wall fittings in most sizes and configurations. Double wall fittings are manufactured on our state of the art fabrication equipment. 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. This requirement is applicable to 20 gauge or less in thickness and 3” W.G. or less. Most double wall fittings are fabricated with Pittsburgh seams. Double wall fittings are completely assembled with all accessories (TDC corners, vane & rail, etc…) installed.
Double wall rectangular duct is constructed with TDC end treatments. There are two different types
- Acoustical double wall duct for noise control
- Thermal double wall duct for temperature control