Aluminium Ducting 12" X 6M - 8 Ply

Non-Insulated Aluminium Ducting 12" X 6M - 8 Ply Hydroponic Ventilation Ducting

This aluminium ducting has a twelve inch diameter and is sold in six meter lengths. It has a max temperature rating of 200 Celsius and has eight layers for extra strength. 

Hint: If you're running one fan in a small tent you can just cut the roll in half - saves you buying two :)