•ALUAFS RECTANGULAR non-insulated aluminium rectangular flexible air ducts are specifically produced for low and medium pressure heating, cooling, ventilation, exhaust, and air conditioning systems. •They provide maximum cross sectional area at the minimum installation space. •Airtight ALUAFS RECTANGULAR is produced from multi-layer aluminium and polyester, strengthened with high tension hard steel spring wire. •ALUAFS RECTANGULAR is highly elastic, flexible and compressible. It can be easily fitted to circular, oval, or rectangular connectors. •The fire resistance of ALUAFS RECTANGULAR has been tested and certified by various international bodies. In case of fire, no toxic or poisonous gases are released.