Produced for the low and medium pressure atmosphere. Inner side is polyester film and outer side is aluminium foil for the usage in heating ventilation air conditioning and gas transition systems. Technical features: Materials: aluminium + polyester Temperature range: -30 + 80 ºC Diameter range: 76 mm - 610 mm Standard lenght: 10 m Air velocity: 30 m/sec Operating pressure: max. 3000 Pa Insulation: 25 mm thickness 16 kg/m3 density glasswool Jackets: outer side aluminium, inner side polyester For any details please request the technical data sheet!