Double Wall Insulated Round Duct

Double wall duct and fittings will consist of a perforated or solid inner liner 1 thick x 1 0 lb ft layer of glass fiber insulation and a solid outer pressure shell.

Double wall insulated round duct.

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. Three standard types of double wall. 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. Thermaduct s inspiral r and floval duct systems are preinsulated spiral and flat oval double wall ductwork alternatives that offer significant weight savings and near zero air leakage.

When a perforated inner liner is specified a retaining fabric must be wrapped between the perforated inner and the glass fiber insulation. Biyang double wall spiral duct is also named dual wall spiral pipe double wall round duct and double wall insulated duct. It is a kind of metal duct designed and produced to offer an excellent acoustical and thermal function for hvac ductwork applications. It is shipped from the factory with the insulation pre installed reducing job site labor costs.