Aluminium Ducting 5" X 6M - 4 Ply

Non-Insulated Aluminium Ducting 5" X 6M - 4 Ply Hydroponic Ventilation Ducting

This aluminium ducting has a five inch diameter and is sold in six meter lengths. It has a max temperature rating of 200 Celsius and has four 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 :)