SPT – Thermal Double Wall Duct

Outer Shell: Solid Galvanized Stell.

Inner Shell: Solid Galvanized Stell.

SPA – Acoustical Double Wall Duct

Outer Shell: Solid Galvanized Stell.

Inner Shell: Perforated Galvanized Stell.

Inner Shell Diameter mm d1

Outer Shell Diameter mm d10=d1+2l

Insulation 25mm Or 50mm

Insulation Density: 24 Kg/m3 As Standard